"You really must be very good at what you do."—"I suppose I am," Kate said modestly.

“你确实非常擅长你所做的。” —“我觉得是吧。”凯特谦虚地说。

《柯林斯英汉双解大词典》

When I think about these unique assets, I get a clear picture of what WHO must do, what we can do, and what we should not do.

当我想到这些独特的资产时，我对世界卫生组织必须做什么，我们能够做什么和我们应该做什么有了一个清晰的蓝图。

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What must I do before I die?

什么是人生必须做的事？

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But what I do remember was, at the end of that long, continuous coverage it must have been about two a.m.

VOA: special.2009.08.16

He says, "I believe in the practice and philosophy of what we have agreed to call magic, in what I must call the evocation of spirits, though I do not know what they are."

他说我相信我们所称作的,关于魔法的实践和哲学，我认为那是对灵魂的召唤，尽管我并不知道它们是什么“

耶鲁公开课 - 现代诗歌课程节选

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

As I sat there thinking what to do, I immediately realized that my meter must have informed my Utility Outage Center that my house did not have any power.

FORBES: When the lights went out, my light went on

But I think what we must do in the present climate, and this is why I think the Prime Minister was right to tackle this head on, is to try and move now to reassure people about the probity of public life, and the financing of political parties because I think that is very very important to do that.

BBC: NEWS | Programmes | Politics Show | Jon Sopel interview

Recognising those demands, it reflects what I must do - as a personal, not a political, priority.

BBC: Nicol Stephen resignation in full