马拉松式的游泳
Marathon-like swimming
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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