How long do you have to be around a person to see him, to estimate how good a lecturer that person is?

你要看一个人多久，才能评估出他讲课有多好？

耶鲁公开课 - 心理学导论课程节选

and try to teach her how to be a good person, how to make right choices.

试着教她怎样做一个好人，怎样做正确的选择。

在空闲时间 - SpeakingMax英语口语达人