俺家做的锻练思考是假设自己没学过课本上的定义方程式，然后自己推出来，再想像一下发现人是怎么想的怎么做的

来源: janeice60 于 2022-12-24 09:41:07 [旧帖] [给我悄悄话] 本文已被阅读：次

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