你知道地球上有五分之一的人说中文吗？

Do you know that one-fifth of the planet speaks Chinese?

youdao

六个月后，选择突然戒烟的人中有超过五分之一的人坚持了下来，而另一组只有七分之一。

Six months out, more people who had quit abruptly had stuck with it—more than one-fifth of them, compared to about one-seventh in the other group.

youdao

只有大约五分之一的人认为，商界和政界高层的女性领导不多主要是因为女性的家庭责任。

Only about one-in-five say women's family responsibilities are a major reason why there aren't more females in top leadership positions in business and politics.

youdao

At the end of this sweep of the disease through your community, one in four, or one in five, of your neighbors would die from the disease.

当这场疾病风暴肆虐完毕之后,你的邻居中,有四分之一或者五分之一的人会死去

耶鲁公开课 - 生物医学工程探索课程节选