49年以前人口增長緩慢的原因主要是原有的社會體係崩壞，疫病流行，兒童（不僅是嬰兒）生存率低。營養非主因

來源: 捕風客於 2022-01-03 10:30:56 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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