Some of those kids will need coronary bypass surgery in their twenties; some of them will be blind by the time they're thirty.

这些孩子有的要在二十多岁时,做冠状动脉搭桥手术,有些人在三十岁的时候会失明

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

It's nice to be around a lot of young people. There's a lot of people in their twenties,

我很喜欢周围有许多年轻人。这儿很多人只有二十来岁。

喜欢环境法课程 - SpeakingMax英语口语达人

people in their... people who are teenagers, people in their twenties,

还有人们在他们……十几岁的人，二十几岁的人，

海德公园的氛围 - SpeakingMax英语口语达人

Almost from the beginning, but increasingly during the twenties, they turned their attention to the problems of literary historiography, and they said some rather bracing things about it.

从一开始，特别是20世纪中，他们越发重视文学历史编撰学，他们提出过一些相当让人振奋的建议。

耶鲁公开课 - 文学理论导论课程节选