20世纪开始时，神学家们主要关心的问题是末世论。

At the beginning of 20th century, the issue that the theologians were concerned about primarily was eschatology.

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人口统计学家推算到了二十世纪末世界人口会加倍。

Demographers have calculated that the world's population will double by the end of the twentieth century.

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人口统计学家推算到了二十世纪末世界人口会加倍。

Demographers have calculated that the world's population will double by the end of the twentieth century.

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