為什麼人只要靜止不動就會浮起來 - 健身
By Candice
at 2008-03-15T00:00
at 2008-03-15T00:00
Table of Contents
我知道密度的問題但是我想問的是為什麼人只要靜止不動躺在水面上就會浮起來但是一但緊張就會往下沉
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健身
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By Susan
at 2008-03-18T07:11
at 2008-03-18T07:11
By Megan
at 2008-03-15T13:04
at 2008-03-15T13:04
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