你的解释，已经先假定箭已经动了，要不增量怎么趋近0？数学要用的对应这个问题才行。

来源: QualityWithoutName 于 2021-10-29 12:44:04 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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