... ChildMonitoring儿童监测 childmortality儿童死亡率 childneglect忽视儿童 ...
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When childmortality declines, couples eventually have fewer children—but that transitionusually takes a generation at the very least.
当儿童死亡率下降时，夫妻终于少生孩子了——但是 这个过渡一般至少要经过一代人。
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