你給他三道題，他如果能用習題課或是數學課上無聊時間，花20分鍾解出來，這一天的時間就沒浪費了。

來源: Pilsung 於 2024-04-06 12:46:23 [舊帖] [給我悄悄話] 本文已被閱讀：次

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