她说黑人中支持民主党的人数比例从百分之九十下降到大约百分之七十。

She says blacks who identify with the Democratic Party have fallen from the 90th percentile down to around 70 percent.

《柯林斯英汉双解大词典》

然而在今天，尽管对拥有出色数学和科学技能的劳动者的需求不断增加，获得科学、数学和工程学位的人数比例却在下降。

Today, however, despite increasing demand for workers with strong skills in mathematics and science, the proportions of degrees awarded in science, math, and engineering are decreasing.

youdao

截至1996年，在国外出生且于1970年前到达美国的移民中拥有房产的人数比例为75.6%，高于本土出生的美国人的 69.8%。

By 1996 foreign-born immigrants who had arrived before 1970 had a home ownership rate of 75.6 percent, higher than the 69.8 percent rate among native-born Americans.

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And it has to do with climate, it has to do with sex ratio--male to female it has to do with diet, and it has to do with movement.

它与风气有关,也与性别比例有关,男性相对于女性的人数,还与饮食有关,与迁移有关

耶鲁公开课 - 美国内战与重建课程节选

Let's say you want to see how something like cigarette smoking is changing in the population and the rates of cigarette smoking, and you want to look at people every five years from 1970 to 2000.

比如你想知道,人群中吸烟者的人数变化,和吸烟者的比例,在1970年至2000年每五年的情况

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选