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。

youdao

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。

youdao