现在有AOPS，Youtube, 大批人都能学好数学物理，不是以前知识不畅通的年代了。娃们不该太傲娇啊

来源: gladys 于 2024-02-12 18:59:11 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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