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The water in most swimming pools is comfortable enough to get into,because workers always heat it.In open water,the temperature(温度)is often much colder.So it's important for most beginners to wear a wetsuit. When you want to swim in a river or lake,ask an ope...
He contends that virtually anyone can be taught to swim. He said many of the adults who come for lessons are over 40 and recognize the exercise value, but “it is hard to exercise in the water if you don’t know how to swim.” The pressure to swim is greater in Southern California,...