He writes home, "I do not intend to shirk now that there is really something to fight for; I mean freedom.

他在家书中道,"我不打算逃避,我必须为之一战,为自由而战

耶鲁公开课 - 美国内战与重建课程节选

When you say "it must", this usually does not mean it needs to do something.

当你说“It must”的时候，通常并不表示它需要做某事。

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Because once you actually push people,to pin them down, what do you mean by it,you end up with something that's either just not true, or not interesting,or not necessary, or not particularly unique to death.

因为你一旦逼问他们这到底是什么含义，得到的东西既不会是真实的，也不会是必要和有趣的，也不会是对于死亡来说独特的。

耶鲁公开课 - 死亡课程节选

When you say "I must" what you mean is "I need to do something."

当你说 "I must"的时候，你是指“我必须得做某事。”

Must 课堂 - SpeakingMax英语口语达人