“提起比萨斜塔，相信很多网友都听说过中学教科书上的两个铁球同时落地”，我昨天遛狗时想过伽利略这个试验。

来源: yanshengjiang 于 2020-08-06 10:33:34 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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