We have four percent of the world's population but 25 percent of its prisoners.
美国人口占到世界的￥%，却占到全球囚犯总人数的25%。
The city has a population of four million.
这座城市有四百万人口。
Reference intervals of four serum enzymes have been set up for the local Chinese population.
建立了部分符合中国人群特征的四种酶参考区间。
Four hundred years ago, the population was over 500 million.
四百年前，人口只有五百多万。
The rate is four times that in the general population.
这个比率是一般民众中精神病人比率的4倍。
The rate is four times that in the general population.
这个比率是一般民众中精神病人比率的4倍。
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