习惯吸烟的人口比重随年龄的增长而上升。

The proportion of regular smokers increases with age.

《牛津词典》

城镇人口比重明显增加。

The proportion of urban residents will notably increase.

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在2000年，西语裔人口比重为12.5%，而非洲裔为12.9%。

In 2000, the last time this count was performed, 12.5% of the population was Hispanic, and 12.9% African-American.

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