北大不是有个地球物理系么？人家对地球研究更专业，你们天文系研究何时仙女星系和银河何时相撞有什么用？

来源: rmny 于 2026-03-25 09:03:16 [旧帖] [给我悄悄话] 本文已被阅读：次

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