我前面已经贴过这个数据，这网站还有一个解释，主要是家庭兜底。Cornell, Penn, 大猫的家庭兜底的少

来源: mjnew 于 2024-12-03 19:17:37 [旧帖] [给我悄悄话] 本文已被阅读：次

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