今天美国犹太人没有外来的移民,但人口不断上升.
而中国人如果没有移民,以不到1.5的生育率,几代就会绝种.
今天美国犹太人没有外来的移民,但人口不断上升.
而中国人如果没有移民,以不到1.5的生育率,几代就会绝种.
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