All tended to have a high slave-to-free ratio of population.

人口中奴隶所占的比例 都是非常高的

耶鲁公开课 - 美国内战与重建课程节选

When you look at the risk of consequences from metabolic syndrome in the population, you have to know a person's race to some extent to understand how high their risk really is.

如果想要考察某人群,患代谢综合征的风险,就要知道一定的种族信息,这样才能较准确地知道他们的患病风险度

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选