The global emergence of the population question poses a serious challenge to many countries and regions.

人口问题在全球范围出现，成为许多国家和地区面临的严重挑战。

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In fact, many scholars, domestic and foreign, also have studied the fluid population question from different aspects.

实际上，国内外很多学者也从不同的角度研究了流动性人口问题。

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The new report is an indication of how things have changed on the population question.

BBC: Scientists urge Rio moves on population and consumption

The question arises: what population level can the United States sustain?

FORBES: U.S. Needs Immigration Reform - Part 3

Senator Routier said a population cap was not out of the question.

BBC: Cap on Jersey population possible says minister