为什么一个装满水矿泉水瓶子可以浮在水面上,但打开瓶盖放入水中又会沉下去? 知乎 Template




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tomski为什么一个装满水矿泉水瓶子可以浮在水面上,但打开瓶盖放入水中又会沉下去? 知乎 coloring