这种马拉松式游泳一般在湖泊或海洋中进行，不需要突然发力和转身，而且上半身的动作比腿部更关键。
There are no flip turns to negotiate in marathon swimming, which is usually held in lakes and oceans, and the upper body is more important than the legs.
这种马拉松式游泳一般在湖泊或海洋中进行，不需要突然发力和转身，而且上半身的动作比腿部更关键。
There are no flip turns to negotiate in marathon swimming, which is usually held in lakes and oceans, and the upper body is more important than the legs.
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