When did you last see a polar bear(北极熊)?On a trip to a zoo,p

When did you last see a polar bear(北极熊)?On a trip to a zoo,perhaps?If you had attended a winter activity in New York a few years ago,you would have seen a whole polar bear club.
These "Polar Bears" are people who meet frequently in the winter to swim in freezing cold water.That day,the air temperature was 3℃,and the water temperature was a bit higher.The members of the Polar Bear Club at Coney Island,New York are usually about the age of 60.Members must satisfy two requirements.
First,they must get along well with everyone else in the group,this is very important because there are so many different kinds of people in the club.Polar Bears must also agree to swim outdoors at least twice a month from November through February.
Doctors do not agree about the medical effects of cold-water swimming.Some are worried about the dangers of a condition in which the body's temperature drops so low that finally the heart stops.Other doctors,however,point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.
The Polar Bears themselves are satisfied with the benefits (or advantages)of cold-water swimming.They say that their favorite form of exercise is very good for the circulatory system(循环系统)because it forces the blood to move fast to keep the body warm.Cold-water swimmers usually turn bright red after a few minutes in the water.A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.
The main benefits (or advantages) of cold-water swimming are probably mental.The Polar Bears love to swim year-round; they find it fun and relaxing.As one 70-year-old woman says."When I go into the water,I pour my troubles into the ocean and let them float away."

你什么时候上看到北极熊（北极熊） 在前往动物园,也许?如果你参加了一个冬天的活动在纽约前几年,你会看到一个整体的北极熊俱乐部.
这些“北极熊”的人谁经常开会的冬季游泳,在严寒的水.这一天,空气温度为3 ℃ ,水温有点高.成员北极熊俱乐部康尼岛,纽约通常是约60岁.会员国必须满足两项要求.
首先,它们必须融洽与每个人的小组,这是非常重要的,因为有这么多不同类型的人在俱乐部.北极熊也必须同意在户外游泳,至少每月两次从11月至2月.
医生不同意对医疗后果的冷水游泳.有些人担心的危险状况中身体的温度下降如此之低,最后心脏停止跳动.其他医生,但指出,有更多的危险,心脏病发作在夏季游泳,因为之间的差异空气温度和水温是更大的夏季比冬季.
北极熊自己感到满意的利益（或优势）冷水游泳.他们说,他们最喜爱的运动形式是非常良好的血液循环系统（循环系统） ,因为它迫使血液迅速采取行动,以保持身体温暖.冷水游泳通常把鲜红几分钟后在水中.一个人谁把蓝色可能有一个非常贫穷的循环系统,不应该尝试冷水游泳.
的主要好处（或优势）冷水游泳可能是精神.北极熊爱游泳,全年;他们找到它的趣味性和放松.作为一个70岁的妇女说.“当我进入水,我争取我的麻烦入海,并让他们漂离.”