蛙式 - 游泳討論

By Doris
at 2009-11-22T17:22
at 2009-11-22T17:22
Table of Contents
蛙式踢腳最主要的前進力量是在夾水的動作,你腳踢的太開你會沒辦法夾水,力量會分散掉
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游泳
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By Catherine
at 2009-11-25T22:03
at 2009-11-25T22:03
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