What exactly that purgation will entail and why Milton's voice needs to be purged at all I think these questions are really the subject of the entire rest of the poem.

这种净化是很有必要的,弥尔顿的语言为什么需要被完全净化,我认为这个问题才是所有剩余诗歌,真正的主题。

耶鲁公开课 - 弥尔顿课程节选

I mean, it's kind of a necessity for a lot of students, myself included, to have these jobs

我的意思是，对于大多数学生而言，
也包括我在内，做这些工作是很有必要的，

再没时间也要挤出来 - SpeakingMax英语口语达人

Probably the best answer is our body is worn out during the day and sleep is necessary to put it back into shape.

最佳的答案应该是,一天下来，我们的身体已经疲惫了,有必要进行睡眠，以恢复状态。

耶鲁公开课 - 心理学导论课程节选

For, as Rutherford has shown the assumption of the existence of nuclei, as those in question seems to be necessary in order to account for the results of the experiments on large angle scattering of the alpha rays.

因此卢瑟福,提出了原子核存在的假设，这些关于问题的假设对于,解释阿尔法粒子的,大角度散射是有必要的。

麻省理工公开课 - 固态化学导论课程节选

And these are kind of need in the kids.

这对于孩子们来说是很有必要的。

麻省理工公开课 - 媒体、教育、市场课程节选

You guys have also seen vectors, I'm pretty sure, but it is worth going over some properties and some may be new and some may be old.

我很肯定你们曾接触过矢量,但复习一下相关的性质是很有必要的,有些可能是新知识,有些是已经学过的

耶鲁公开课 - 基础物理课程节选

If,when we interpret the claim everyone dies alone, that just ends up being a slightly pretentious way of saying everyone dies, we might say,oh yeah,that is true and it is a necessary truth, but it's not especially surprising.

如果我们对每个人都孤独而死的诠释，只是装模作样地说明人终有一死，那我们会说，这是真理，也是必要的，但并没有什么好惊奇的。

耶鲁公开课 - 死亡课程节选

Just as a note, I cued you about the level of detail I'm expecting you to acquire from class and from the readings, and I'm not so interested that you memorize those particular sugars and which category they fall under, but it is interesting to know that there are different types of sugars.

温馨提示,我会告诉大家我希望你们,能从课堂和阅读中学到的知识深度,我并不要求大家记住这些特殊的糖类,以及他们都属于哪个类别,但是知道有不同类型的糖是有必要的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Because sometimes it's useful to think about the payoffs, as coming from "i's" own choice and everyone else's choices.

因为有时候考虑在i和对手,在不同选择下的收益是很有必要的

耶鲁公开课 - 博弈论课程节选

I know that some felt the pace of the arguments was a little slow, but I felt that this was generally necessary, not only for the unphilosophy-savvy population, but also to cover all points."

我知道有人认为论证过程有点慢，但我感觉这样做总体上讲是有必要的，不只是为了不懂哲学的同学们，也是为了能覆盖所有推理内容“

耶鲁公开课 - 死亡课程节选