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刘耀文的大沙雕
钟意阿满
如何理解Python装饰器
三十万韩元等于多少人民币三十万韩元是多少人民币。
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三十万韩元等于多少人民币三十万韩元是多少人民币。
来自：网络日期：2022-05-05。
1000韩币=6元人民币根据汇率会有浮动基本上按6元算就可以了三十万等于1800元。
根据2019年12月05日汇率，300000韩元=1772.1866人民币元。举例：一瓶矿泉水人民币3元，则需要韩元：3*168.7609韩元=506.2827韩元；一桶泡面需要800韩元，则需要人民币：800*0.0059人民币=4.72人民币。韩币有纸币和硬币两种。纸币有1000韩元、5000韩元、10000韩元、50000韩元四种，分别折合人民币5.9、29.6，59.2、296元。截止2019年12月，流通的韩国硬币有10韩元、50韩元、100韩元、500韩元四种（10韩元是最小单位），分别折合人民币0.06元、0.3元、0.59元、2.96元。扩展资料：人民币汇率从利的方面看1、一国货币能够升值，一般说明该国经济状况良好。因为在正常情况下，只有经济健康稳定地增长，货币才有可能升值。这种由经济状况良好带来的币值的稳中有升，对外资的吸引力是极大的。2、中国仍然有居高不下的外贸顺差和巨额的外汇储备，中国的经济增长仍然是世界范围内最有看点的风景，因此货币升值的长期趋势不会改变。3、有利于减轻外债还本付息压力，人民币汇率的上升，未偿还外债还本付息所需本币的数量相应减少，从而在一定程度上减轻了外债负担。参考资料来源：百度百科—人民币汇率。
中国工商银行人民币即期外汇牌价日期:2006年3月15日星期三单位:人民币/100外币币种汇买、汇卖中间价现汇买入价现钞买入价卖出价基准价美元(USD)803.88802.27795.84805.49803.88港币(HKD)103.61103.40102.57103.82103.61日元(JPY)6.84856.82116.60206.87596.8311欧元(EUR)966.75962.88931.95970.62966.20英镑(GBP)1404.381398.761353.821410.00--瑞士法郎(CHF)617.51615.04595.28619.98--加拿大元(CAD)695.70692.92670.65698.48--澳大利亚元(AUD)593.99591.61572.61596.37--新加坡元(SGD)495.27493.29477.44497.25--丹麦克朗(DKK)129.56129.04124.90130.08--挪威克朗(NOK)121.34120.85116.97121.83--瑞典克朗(SEK)103.19102.7899.48103.60--澳门元(MOP)100.41100.2199.41100.61--新西兰元(NZD)516.33514.26497.74518.40--韩元(KRW)0.8252--0.78230.8681--备注:此汇率为我行初始报价,成交价以各地分行实际交易汇率为准所以,一万人民币=1288280.00韩元。
a2();
30万韩元等于多少人民币-：300000韩元≈1755.3417人民币元.由于汇率是实时变动的,此数据仅供参考,具体汇率以您交易时实际交割的成交价为准,更新时间:2020-07-2208:44.应答时间:2020-07-23,最新业务变化请以平安银行官网公布为准.[平安车主贷]有车就能贷,最高50万https://b.pingan.com.cn/station/activity/loan/qr-carloan/loantrust.html?source=sa0000632&outerSource=bdzdhhr_zscd&outerid=ou0000250&cid=bdzdhhr_zscd&downapp_id=AM001000065。
30万韩元相当于多少人民币：韩元对人民币汇率:300000韩元(KRW)=1680人民币(CNY)韩元100汇率0.0056人民币0.56买入价0.0056卖出价0.0056最近更新2012年2月22日22时55分。
三十万韩币等于人民币多少?：可兑换300000*0.5164/100=1549.2元人民币汇率经常在变,可参考。
30万韩元等于多少人民币-：货币兑换1人民币=165.3776韩元1韩元=0.0060人民币30万韩元*0.0060=0.18万人民币=1800人民币以上为中国银行汇率信息,仅供参考.交易时请以银行柜台成交价为准.汇率数据更新时间:2014-08-1520:52望采纳。
30万元韩币等于多少人民币-：30万韩币大约等于1772.2元人民币....。
三十万韩元等于多少人民币-：因为1韩元=0.005959元人民币,所以300000韩元=300000*0.005959=1787.7元人民币!。
现在30万韩元等于多少元人民币啊?-：时间:2009.05.1806:31:08,100韩国元兑换人民币数货币名称现钞买入价卖出价中行折算价发布时间韩国元0.51640.55570.53052009.05.1806:31:0830万韩元可兑换300000*0.5164/100=1549.2元人民币汇率经常在变,可参考http://www.boc.cn/sourcedb/whpj/。
三十万韩元相当于多少人民币-：1693.5193。
30万韩元等于多少人民币?：截至2008.08.0104:53:02UTC的实时平均市场汇率.300,000.00KRW=2,024.94CNY韩国圆中国人民币。
30万韩元可以兑换多少人民币：按今天外汇牌价100韩元兑0.5592元,30万韩元可兑1677.6元人民币.。
a3();
rgg_s();
rgg_ss();
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用英语介绍水母！急啊~！急啊~！急啊~！急啊~！急啊~！急啊~！
作者：zhijun liu
链接：http://www.zhihu.com/question/26930016/answer/99243411。
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先来个形象比方
内裤可以用来遮羞，但是到了冬天它没法为我们防风御寒，聪明的人们发明了长裤，有了长裤后宝宝再也不冷了，装饰器就像我们这里说的长裤，在不影响内裤作用的前提下，给我们的身子提供了保暖的功效。
再回到我们的主题
装饰器本质上是一个Python函数，它可以让其他函数在不需要做任何代码变动的前提下增加额外功能，装饰器的返回值也是一个函数对象。它经常用于有切面需求的场景，比如：插入日志、性能测试、事务处理、缓存、权限校验等场景。装饰器是解决这类问题的绝佳设计，有了装饰器，我们就可以抽离出大量与函数功能本身无关的雷同代码并继续重用。概括的讲，装饰器的作用就是为已经存在的对象添加额外的功能。
先来看一个简单例子：
def foo():
print('i am foo')。
现在有一个新的需求，希望可以记录下函数的执行日志，于是在代码中添加日志代码：
def foo():
print('i am foo')。
logging.info("foo is running")。
bar()、bar2()也有类似的需求，怎么做？再写一个logging在bar函数里？这样就造成大量雷同的代码，为了减少重复写代码，我们可以这样做，重新定义一个函数：专门处理日志 ，日志处理完之后再执行真正的业务代码。
def use_logging(func):。
logging.warn("%s is running" % func.__name__)。
func()
def bar():
print('i am bar')。
use_logging(bar)。
逻辑上不难理解， 但是这样的话，我们每次都要将一个函数作为参数传递给use_logging函数。而且这种方式已经破坏了原有的代码逻辑结构，之前执行业务逻辑时，执行运行bar()，但是现在不得不改成use_logging(bar)。那么有没有更好的方式的呢？当然有，答案就是装饰器。
简单装饰器
def use_logging(func):。
def wrapper(*args, **kwargs):。
logging.warn("%s is running" % func.__name__)。
return func(*args, **kwargs)。
return wrapper。
def bar():
print('i am bar')。
bar = use_logging(bar)。
bar()
函数use_logging就是装饰器，它把执行真正业务方法的func包裹在函数里面，看起来像bar被use_logging装饰了。在这个例子中，函数进入和退出时 ，被称为一个横切面(Aspect)，这种编程方式被称为面向切面的编程(Aspect-Oriented Programming)。
@符号是装饰器的语法糖，在定义函数的时候使用，避免再一次赋值操作。
def use_logging(func):。
def wrapper(*args, **kwargs):。
logging.warn("%s is running" % func.__name__)。
return func(*args)。
return wrapper。
@use_logging
def foo():
print("i am foo")。
@use_logging
def bar():
print("i am bar")。
bar()
如上所示，这样我们就可以省去bar = use_logging(bar)这一句了，直接调用bar()即可得到想要的结果。如果我们有其他的类似函数，我们可以继续调用装饰器来修饰函数，而不用重复修改函数或者增加新的封装。这样，我们就提高了程序的可重复利用性，并增加了程序的可读性。
装饰器在Python使用如此方便都要归因于Python的函数能像普通的对象一样能作为参数传递给其他函数，可以被赋值给其他变量，可以作为返回值，可以被定义在另外一个函数内。
带参数的装饰器
装饰器还有更大的灵活性，例如带参数的装饰器：在上面的装饰器调用中，比如@use_logging，该装饰器唯一的参数就是执行业务的函数。装饰器的语法允许我们在调用时，提供其它参数，比如@decorator(a)。这样，就为装饰器的编写和使用提供了更大的灵活性。
def use_logging(level):。
def decorator(func):。
def wrapper(*args, **kwargs):。
if level == "warn":。
logging.warn("%s is running" % func.__name__)。
return func(*args)。
return wrapper。
return decorator。
@use_logging(level="warn")。
def foo(name='foo'):。
print("i am %s" % name)。
foo()
上面的use_logging是允许带参数的装饰器。它实际上是对原有装饰器的一个函数封装，并返回一个装饰器。我们可以将它理解为一个含有参数的闭包。当我 们使用@use_logging(level="warn")调用的时候，Python能够发现这一层的封装，并把参数传递到装饰器的环境中。
类装饰器
再来看看类装饰器，相比函数装饰器，类装饰器具有灵活度大、高内聚、封装性等优点。使用类装饰器还可以依靠类内部的\_\_call\_\_方法，当使用 @ 形式将装饰器附加到函数上时，就会调用此方法。
class Foo(object):。
def __init__(self, func):。
self._func = func。
def __call__(self):。
print ('class decorator runing')。
self._func()。
print ('class decorator ending')。
@Foo
def bar():
print ('bar')。
bar()
functools.wraps。
使用装饰器极大地复用了代码，但是他有一个缺点就是原函数的元信息不见了，比如函数的docstring、__name__、参数列表，先看例子：
装饰器
def logged(func):。
def with_logging(*args, **kwargs):。
print func.__name__ + " was called"。
return func(*args, **kwargs)。
return with_logging。
函数
@logged
def f(x):
"""does some math"""。
return x + x * x。
该函数完成等价于：
def f(x):
"""does some math"""。
return x + x * x。
f = logged(f)
不难发现，函数f被with_logging取代了，当然它的docstring，__name__就是变成了with_logging函数的信息了。
print f.__name__ # prints 'with_logging'。
print f.__doc__ # prints None。
这个问题就比较严重的，好在我们有functools.wraps，wraps本身也是一个装饰器，它能把原函数的元信息拷贝到装饰器函数中，这使得装饰器函数也有和原函数一样的元信息了。
from functools import wraps。
def logged(func):。
@wraps(func)。
def with_logging(*args, **kwargs):。
print func.__name__ + " was called"。
return func(*args, **kwargs)。
return with_logging。
@logged
def f(x):
"""does some math"""。
return x + x * x。
print f.__name__ # prints 'f'。
print f.__doc__ # prints 'does some math'。
内置装饰器
@staticmathod、@classmethod、@property。
装饰器的顺序
@a
@b
@c
def f ():
等效于
f = a(b(c(f)))
编辑于 2016-08-09
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许多人选择编程是因为他们喜欢把时间花在…
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先理解一下闭包的概念吧，之前回答过一个有关闭包和装饰器的问题，可以参考一下：Python 里函数里返回一个函数内部定义的函数？ - 知乎用户的回答。
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先理解一下闭包的概念吧，之前回答过一个有关闭包和装饰器的问题，可以参考一下：
Python 里函数里返回一个函数内部定义的函数？ - 知乎用户的回答。
发布于 2014-12-09
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罗伊后端工程师
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内置语法糖 格式优美 逼格较高在代码中使用洽到好处的装饰器瞬间让代码优美很多 写起来也很简单 无参的装饰器参数是要装饰的函数 有参装饰器参数是需要的参数 最后返回的是内部函数 参考http://m.blog.csdn.net/blog/yueguanghaidao/10089181。
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内置语法糖 格式优美 逼格较高。
在代码中使用洽到好处的装饰器瞬间让代码优美很多 。
写起来也很简单 无参的装饰器参数是要装饰的函数 有参装饰器参数是需要的参数 最后返回的是内部函数 参考http://m.blog.csdn.net/blog/yueguanghaidao/10089181。
发布于 2014-12-06
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之前给出一个链接, 现在尝试用自己方式梳理一下 # 有时爱用蹩脚的英文注释, 唔.>># 先从函数说起def foo1():。
print('this is a function')。
foo1() # print ... in console.'这是一种最为简单的函数-- 不涉及到任何变量, 参数 只是做了一件不以为然的事儿'…
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之前给出一个链接, 现在尝试用自己方式梳理一下 # 有时爱用蹩脚的英文注释, 唔.。
>>
# 先从函数说起
def foo1():
print('this is a function')。
foo1() # print ... in console.。
'这是一种最为简单的函数-- 不涉及到任何变量, 参数 只是做了一件不以为然的事儿'。
# 函数的域 作用范围 以及一个局部变量。
global_string = 'this is a global string, my name is global_string'。
def foo2():
# lets see its locals variable。
# local variable in foo2。
x = 3
print('foo2 locals:', locals())。
foo2() # foo2 locals: {'x': 3}。
print('-'*40)
# check global variable # gets a dictionary, and global_string inside.。
# print('globals:' , globals())。
# 一个变量的生存的周期
def foo3():
x = 3
print("x value:" , x)。
foo3()
'try to run x += 3'。
# x += 5, uncomment when you run.。
# get NameError -- x is not defined = x is dead.。
# 下面来看带有参数的函数
def foo4(s):
print('<i am foo4, i can print>', s)。
foo4('foobar')
## 或者可以多个参数, 甚至是默认的。
def foo5(s, repeat= 3):。
print('<i am foo5, i can print over and over>', s*repeat)。
foo5('foobar')
'if call a function with un-matched arguments, error comes'。
# foo5(1,2,3) # TypeError: foo5() takes from 1 to 2 positional arguments but 3 were given。
'foo5 能接收1-2个参数, 大哥你给了3个. typeerror'。
# 嵌套函数
def outer():
x = 71
def inner():。
print('hello, i am inner')。
print('outer variable x ',x)。
inner()
outer()
'可以看到 内部函数能够访问外部函数的变量'。
# 把函数当作一个对象
'查看类的属性 __class__ built-in function'。
i = 3
print(i.__class__) # <class 'int'>。
print(outer.__class__) # <class 'function'>。
'''
# ==> 所以 既然 一个整数i 可以当作某函数的参数,。
那么 这里的 函数 outer 当然也可以作为某个函数的参数!。
'''
def applyfunc(func,args,repeat=3):。
i = 0
repeat = 3 if repeat <= 1 else repeat。
while i < repeat:。
func(args)。
i += 1
def test(s):
print('a test function', s)。
applyfunc(test, 'love is important', repeat=3)。
'可以看到 通过调用一个函数 applyfunc -- 让一个简单函数运行至少3次'。
# Closures 不想翻译成闭包。
def outer2():
x = 127
def inner2():。
print(x)。
return inner2。
foobar = outer2()。
foobar # print nothing。
print(foobar.__closure__) # (<cell at 0x00706230: int object at 0x5C3EC7F0>,)。
'可以看到 foobar中封存了一个整数对象 int object at 0x......'。
foobar() # print。
'x 是outer2中的局部变量, 只有当outer2运行时 x才开始出现.'。
## Closures-2
def outer(x):
def inner():。
print('inner just print x:', x)。
return inner。
print1 = outer(1)。
print2 = outer(2)。
print(print1.__closure__) # int object at 0x5C3EC010>。
print(print2.__closure__) # int object at 0x5C3EC020>,。
print1()
print2()
#== closure 是Python中一种机制, 对enclosing variables 的一个'储藏柜'。
# Decorators 终于到了装饰器。
def outer(somefunc):。
def inner():。
print('have not run ', somefunc.__name__, end='\n')。
result = somefunc()。
print(result + ' finished' )。
return inner。
def foo6():
return 'i am foo6'。
decorator = outer(foo6)。
decorator()
'上例演示了decorator 基本作用 - 以函数作参数, 并且输出一个装饰后的新函数'。
'就字面理解下, 原来的函数是个毛坯房 只有一床板凑合睡, 找2装修小工后,爽了.'。
# decorator - 2 , look like more useful。
class Point(object):。
def __init__(self, x, y):。
self.x = x。
self.y = y。
def __repr__(self):。
return 'I am a {name}, my attributes: {dict}'.format(name = self.__class__.__name__, dict=self.__dict__)。
## definition calculation。
def add(a, b):
return Point(a.x + b.x, a.y+b.y)。
p1 = Point(500, 10)。
print(p1)
p2 = Point(30, -100)。
print(add(p1,p2))。
'Now we want to do some value-check, to make sure the x, y validation'。
'比如我们现在只想要点运算时 作数值的检查: 要求点是 100*100这个范围的 (0-100 这个正方形内) ,对于异常作边界处理'。
def wrapper(func):。
def checker(a, b):。
a. x = max(0, a.x) ; a. y = max(0, a.y)。
a. x = min(100, a.x);a. y = min(100, a.y)。
b. x = max(0, b.x) ; b. y = max(0, b.y)。
b. x = min(100, b.x);b. y = min(100, b.y)。
result = Point(a.x +b.x, a.y+b.y)。
return result。
return checker。
add_decorator = wrapper(add)。
p1 = Point(500, 10)。
p2 = Point(30, -100)。
# print(add(p1,p2))。
print('decorator !')。
print(add_decorator(p1, p2))。
#=> after check, it becomes 100+30, 10+0。
# 最后 @ 符号
'因为装饰会经常使用, 为了避免上述麻烦的装饰方法 就想到一个简写'。
@wrapper
def add_checked(a, b):。
return Point(a.x +b.x, a.y+b.y)。
print('skilled decorator using @')。
print(add_checked(p1, p2))。
evernote 文字版, 习惯用这个存了. 。
'一步步理解Python中的Decorator'。
原文参考:
# 'refer: simeonfranklin.com'。
推荐阅读:
<Python Cookbook> chapter 9 - Metaprogramming, 9.1 9.2 ...。
大圣杰锅是
平安银行信用卡为什么要二十岁
下面的网址里图片也有，解剖水母的介绍也有。
Jellyfish are marine invertebrates belonging to the Class Scyphozoa within the Phylum Cnidaria. They can be found in every ocean in the world. The use of the term "jellyfish" is actually a misnomer since scyphozoans are not fish, which are vertebrates. The term is also (incorrectly) commonly-applied to some close relatives of true scyphozoans, such as the Hydrozoa and the Cubozoa.。
Anatomy and morphology。
A typical scyphomedusa jellyfish.。
A typical scyphomedusa jellyfish.。
The body of an adult jellyfish consists of a bell shape producing jelly and enclosing its internal structure, from which tentacles are suspended. Each tentacle is covered with cells called cnidocytes, that can sting or kill other animals. Most jellyfish use these cells to secure prey or for defense. Others, such as Rhizostomae, do not have tentacles at all.。
Jellyfish lack basic sensory organs and a brain, but their nervous systems and rhopalia allow them to perceive stimuli, such as light and odor, and respond quickly. They feed on small fish and zooplankton that become caught in their tentacles. Most jellyfish are passive drifters and slow swimmers, as their shape is not hydrodynamic. Instead, they move so as to create a current forcing the prey within reach of their tentacles. They do this by rhythmically opening and closing their bell-like body. Their digestive system is incomplete: the same orifice is used to take in food and expel waste.。
The body of an adult is made up of 94–98% water, and the bell shape consists of a layer of epidermis, gastrodermis, and a thick layer called mesoglea that produces most of the jelly and separates the epidermis from the gastrodermis.。
[edit] Defense
Most jellyfish have tentacles or oral arms coated with thousands of microscopic nematocysts; generally, each nematocyst has a "trigger" (cnidocil) paired with a capsule containing a coiled stinging filament, as well as barbs on the exterior. Upon contact, the filament rapidly unwinds, launches into the target, and injects toxins. It can then pull the victim into its mouth, if appropriate.。
Although most jellyfish are not perniciously dangerous to humans, a few are highly toxic, such as Cyanea capillata. The recently discovered Carukia barnesi is also suspected of causing two deaths in Australia. Contrary to popular belief, the menacingly infamous Portuguese Man o' War (Physalia) is not a jellyfish, but a colony of hydrozoan polyps. Regardless of the actual toxicity of the stings, many victims find them very painful, and some individuals may have severe allergic reactions, anaphylactic shock, similar to bee sting allergic reactions[1]。
[edit] Body systems。
A jellyfish detects the touch of other animals using a nervous system called a "nerve net", found in its epidermis. Touch stimuli are collected by nerve rings, through the rhopalial lappet located around the animal's body, to the nerve cells. Jellyfish also have ocelli that cannot form images but are sensitive to light; the jellyfish can use these to determine up from down, basing its judgement on sunlight shining on the surface of the water.。
Jellyfish do not have a specialized digestive system, osmoregulatory system, central nervous system, respiratory system, or circulatory system. They digest using the gastrodermis that lines the gastrovascular cavity, where nutrients from their food are absorbed. They do not need a respiratory system since their skin is thin enough that oxygen diffuses into their bodies. They have limited control over their movement and mostly free-float, but can use a hydrostatic skeleton that controls the water pouch in their body to actuate vertical movement.。
The outer side of jellyfish is lined with a jelly-like material called ectoplasm ("outer plasma"). It typically contains a smaller amount of protein granules and other organic compounds than inner cytoplasm, also referred to as endoplasm.。
[edit] Ecology, behavior and life history。
[edit] Behavior。
Flower hat jelly.。
Flower hat jelly.。
Many species of jellyfish are also capable of congregating into large swarms or "blooms" consisting of hundreds or even thousands of individuals. The formation of these blooms is a complex process that depends on ocean currents, nutrients, temperature and oxygen content. Jellyfish sometimes mass breed during blooms. Jellyfish population is reportedly raising major ecological concerns for a possible jellyfish outbreak.。
The frequency of these blooms may be attributed to humankind's impact on marine life, according to Claudia Mills of the University of Washington. She says that the breeding jellyfish may merely be taking the place of already overfished creatures. Jellyfish researcher Marsh Youngbluth further clarifies that "jellyfish feed on the same kinds of prey as adult and young fishes, so if fish are removed from the equation, jellyfish are likely to move in."。
Increased nutrients in the water, ascribed to agricultural runoff, have also been cited as an antecedent to the recent proliferation of jellyfish numbers. Scientist Monty Graham says that "ecosystems in which there are high levels of nutrients ... provide nourishment for the small organisms on which jellyfish feed. In waters where there is eutrophication, low oxygen levels often result, favoring jellyfish as they thrive in less oxygen-rich water than fish can tolerate. The fact that jellyfish are increasing is a symptom of something happening in the ecosystem."。
By sampling sea life in a heavily fished region off the coast of Namibia, researchers found that jellyfish have overtaken fish in terms of the biomass they contribute to this ocean region. The findings represent a careful quantitative analysis of what has been called a "jellyfish explosion" following intense fishing in the area in the last few decades. The findings were reported by Andrew Brierley of the University of St. Andrews and his colleagues in the July 12, 2006 issue of the journal Current Biology.。
Areas seriously affected by jellyfish blooms include the northern Gulf of Mexico, Graham states, "Moon jellies have formed a kind of gelatinous net that stretches from end to end across the gulf," .[2] Jellyfish are commonly spotted along coastal shores.。
[edit] Life history。
The developmental stages of jellyfish.。
The developmental stages of jellyfish.。
Most jellyfish pass through two different body forms during their life cycle. The first is the polyp stage, when the jellyfish takes the form of either a sessile stalk which catches passing food, or a similar free-floating configuration. The polyp's mouth and tentacles face upwards.。
In the second stage, the jellyfish is known as a medusa. Medusae have a radially symmetric, umbrella-shaped body called a bell. The medusa's tentacles hang from the border of the bell. (Medusa is also the Hebrew, Spanish and Italian word for jellyfish.)。
Jellyfish are dioecious; that is, they are either male or female. In most cases, to reproduce, a male releases his sperm into the surrounding water. The sperm then swims into the mouth of the female, allowing the fertilization of the ova to begin. However, moon jellies use a different process: their eggs become lodged in pits on the oral arms, which form a temporary brood chamber to accommodate fertilization.。
After fertilization and initial growth, a larval form, called the planula, develops from the egg. The planula larva is small and covered with cilia. It settles onto a firm surface and develops into a polyp. The polyp is cup-shaped with tentacles surrounding a single orifice, perhaps resembling a tiny sea anemone. Once the polyp begins reproducing asexually by budding, it is called a segmenting polyp, or a scyphistoma. New scyphistomae may be produced by budding or new, immature jellies called ephyra may be formed. Many jellyfish can bud off new medusae directly from the medusan stage.。
Most jellyfish have a lifespan of two and a half months; few live longer than six months.。
[edit] Etymology and taxonomic history。
Since jellyfish are not fish, some people consider the term "jellyfish" a misnomer, and instead use the term "jellies" or "sea jellies". The word "jellyfish" is also often used to denote either Hydrozoa or the box jellyfish, Cubozoa. The class name Scyphozoa comes from the Greek word skyphos, denoting a kind of drinking cup and alluding to the cup shape of the organism.。
A group of jellyfish is often called a "smuck".[3]。
[edit] Importance to humans。
[edit] Culinary uses。
Jellyfish is an important food in the Chinese community and many Asian countries.[1] Only jellyfish belonging to the Order Rhizostomeae are harvested for food. The rhizostomes (Rhopilema esculentum, Chinese name: 海蜇) are favoured because they are typically larger and have more rigid bodies than other scyphozoan orders. Traditional processing methods involve a multi-phase processing procedure using a mixture of table salt and alum, and then desalting.[1] Processing makes the jellyfish drier and more acidic, producing a "crunchy and crispy texture."[1] Nutritionally, jellyfish prepared this way are roughly 95% water and 4-5% protein, making it a relatively low calorie food.[1]。
[edit] In biotechnology。
In 1961, Green Fluorescent Protein was discovered in the jellyfish Aequorea victoria by scientists studying bioluminescence. This protein has since become one of the most useful tools in biology.[2]。
[edit] In captivity。
A group of Sea Nettle jellyfish in an aquarium.。
A group of Sea Nettle jellyfish in an aquarium.。
Jellyfish are commonly displayed in aquariums in many countries; among the more known are the Monterey Bay Aquarium, Long Beach Aquarium of the Pacific, Vancouver Aquarium, Seattle Aquarium, and Maui Ocean Center. Often the tank's background is blue with the animals illuminated by side lighting to produce a high contrast effect. In natural conditions, many of the jellies are so transparent that they can be almost impossible to see.。
Holding jellies in captivity also presents other problems: for one, they are not adapted to closed spaces or areas with walls, which aquariums by definition have. They also depend on the natural currents of the ocean to transport them from place to place. To compensate for this, professional exhibits feature precise water flow patterns, typically in circular tanks to prevent specimens from becoming trapped in corners. The Monterey Bay Aquarium uses a modified version of the kreisel (German for "spinning top") for this purpose.。
[edit] Toxicity to humans。
When stung by a jellyfish, first aid may be in order. Though most jellyfish stings are not deadly, some stings, such as those perpetrated by the box jellyfish (Chironex fleckeri) may be fatal. Serious stings may cause anaphylaxis and eventual death, and hence people stung by jellyfish must get out of the water to avoid drowning. In these serious cases, advanced professional care must be sought. This care may include administration of an antivenom and other supportive care such as required to treat the symptoms of anaphylactic shock. The most serious threat that humans face from jellyfish is the sting of the Irukandji, which has the most potent and deadly venom of any known jellyfish species.。
There are three goals of first aid for uncomplicated jellyfish stings: prevent injury to rescuers, inactivate the nematocysts, and remove any tentacles stuck on the patient. To prevent injury to rescuers, barrier clothing should be worn. This protection may include anything from panty hose to wet suits to full-body sting-proof suits. Inactivating the nematocysts, or stinging cells, prevents further injection of venom into the patient.。
Vinegar (3 to 10% acetic acid in water) should be applied for box jellyfish stings.[3][4] However, vinegar is not recommended for Portuguese Man o' War stings.[3] In the case of stings on or around the eyes, vinegar may be placed on a towel and dabbed around the eyes, but not in them. Salt water may also be used in case vinegar is not readily available.[3][5] Fresh water should not be used if the sting occurred in salt water, as a change in pH can cause the release of additional venom. Rubbing the wound, or using alcohol, spirits, ammonia, or urine will encourage the release of venom and should be avoided.[6]。
Once deactivated, the stinging cells must be removed. This can be accomplished by picking off tentacles left on the body.[6] First aid providers should be careful to use gloves or another readily available barrier device to prevent personal injury, and to follow standard universal precautions. After large pieces of the jellyfish are removed, shaving cream may be applied to the area and a knife edge, safety razor, or credit card may be used to take away any remaining nematocysts.[7]。
Beyond initial first aid, antihistamines such as diphenhydramine (Benadryl) may be used to control skin irritation (pruritus).[7] To remove the venom in the skin, apply a paste of baking soda and water and apply a cloth covering on the sting. If possible, reapply paste every 15-20 minutes. Ice can be applied to stop the spread of venom until either of these is available.。
For at least some jellyfish, it seems to be safe to touch their tentacles with the palm of the hand.。
[edit] In entertainment。
Anthropomorphized jellyfish are characters in several popular video games, such as Pokémon's Tentacool, and in TV and film animation, such as SpongeBob SquarePants and Shark Tale. Like many other aquatic life forms, both real and anthropomorphized jellyfish have been represented in countless other aquatic-themed entertainment as well.。
小韩在追星
几个产品介绍的英语单词
1、信用卡审核需经我行综合评分，主要参考的因素较多，如年龄、工作、收入、学历等，也会参照您在其他银行的持卡、用卡或在其他机构的信用情况等；您可以登录平安口袋银行APP-信用卡-在线办卡尝试申请；
2、信用卡申请条件：如果您是首次办卡，办卡年龄：
我行信用卡（除港澳台地区）主卡申请人年龄：20-65周岁（含），平安BE@RBRICK时尚信用卡主卡申请人年龄：20-40周岁（含）；【港澳台及外籍人士：年龄须为25～65周岁（含）；BE@RBRICK时尚信用卡：年龄须为25～40周岁（含）；】
3、必须提交的资料：
信用卡申请书、身份证明正反面复印件和单位开具的工作证明文件。建议可附加一些财力证明，有助于信用卡核发及提高信用额度。
应答时间：2020-07-22，最新业务变化请以平安银行官网公布为准。
[平安车主贷] 有车就能贷，最高50万。
https://b.pingan.com.cn/station/activity/loan/qr-carloan/loantrust.html?source=sa0000632&outerSource=bdzdhhr_zscd&outerid=ou0000250&cid=bdzdhhr_zscd&downapp_id=AM001000065。
小韩在追星
你好我申请了一张3万额度的平安银行信用卡我可以取现2万5出来吗每个月还1500元的额度那每月是要还
Outer Quantity/Container: 2 dozen。
每个包装的外包装数量:2打
Outer Volume/Container: (Cubic Meter) 0.09。
每个包装的外体积:0.09立方米。
Gross Weight (kgs): 17.0 。
毛重:17.0公斤