By the mid-19th century most of Europe was in the first stage of the demographic transition.

到19世纪中叶，欧洲的大部分地区处于人口转变的第一阶段。

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By the mid-19th century most of Europe was in the first stage of the demographic transition.

到19世纪中叶，欧洲的大部分地区处于人口转变的第一阶段。

youdao