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人的比重约等于 1,仰泳的时候,由于除脸部以外全身都在水下,浮力最大,不用费力就可以漂在水面上,所以最轻松。上下打水是比赛动作,你不需要。按爱雪的猪说的做。

rollor (Rollor)
(#176028@0)
2001-8-22 -04:00
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