今天美國猶太人沒有外來的移民,但人口不斷上升.
而中國人如果沒有移民,以不到1.5的生育率,幾代就會絕種.
今天美國猶太人沒有外來的移民,但人口不斷上升.
而中國人如果沒有移民,以不到1.5的生育率,幾代就會絕種.
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