對時間的二階導數在另一邊。這個老郭是不是完全理解？請您回一下。您說理解了，我接著往下講。

來源: 蔣聞銘於 2024-11-07 16:05:26 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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