"The purpose of this review is clear: We must compile every piece of information that was known about the gunman, and we must learn what was done with that information.

VOA: standard.2009.11.16

You must learn to read closely.

你们必需要学着仔细地阅读。

耶鲁公开课 - 政治哲学导论课程节选

This "you have to" pattern is something that you really must learn,

you have to”句型是英语学习中必不可少的句型，

have to 课堂 - SpeakingMax英语口语达人

Join us as we learn about the cultural value of language and why endangered languages must be protected.

VOA: special.2009.12.02

The new prince, as we've seen, must know how to use religion but needs to learn how not to be used by religion, must not become a dupe of the religious.

正如我们所看到的，这种新型君主必须知道,如何去利用宗教而不是被宗教所利用,必须避免成为受宗教愚弄摆布的对象。

耶鲁公开课 - 政治哲学导论课程节选

And because most of the new immigrants are people of color, cultural adjustments must be made by all groups in America if we are to learn to live together as one nation."

VOA: special.2011.03.20