When they thought it was necessary, they maintained peace by destroying communities and forcibly moving populations.

一旦他们觉得有必要，就会为了维护和平，毁灭其他群体,强制迁移人口。

耶鲁公开课 - 新约课程节选

I can't help but I feel I need to ask you this question.

我觉得很有必要问您一个问题。

普林斯顿公开课 - 国际座谈会课程节选

I think they are quite memorable.

我觉得是很有必要记住这些内容。

耶鲁公开课 - 1945年后的美国小说课程节选