70年代仅有24个国家的生育率为2.1或更低，都是富裕国，而现在有70多个这样的国家，分布在各个大陆，包括非洲。

In the 1970s only 24 countries had fertility rates of 2.1 or less, all of them rich.Now there are over 70 such countries, and in every continent, including Africa.

youdao

70年代仅有24个国家的生育率为2.1或更低，都是富裕国，而现在有70多个这样的国家，分布在各个大陆，包括非洲。

In the 1970s only 24 countries had fertility rates of 2.1 or less, all of them rich. Now there are over 70 such countries, and in every continent, including Africa.

youdao

事实上，gremlin在20世纪20年代首次被记录下来时为皇家空军对一个承受严酷任务的低级军官或征召者的称呼。

In fact, gremlin is first recorded only in the 1920's, as a Royal Air Force term for a low-ranking officer or enlisted man saddled with oppressive assignments.

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