What is the company's policy? You must be certain that you know what it is!

公司的政策是什么？你必须确信你知道政策是什么！

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Because other forms of respiratory infection including PCP are common among HIV-infected people, doctors must be certain of diagnosis before administering antibiotics.

由于包括卡式肺囊虫肺炎在内的其他呼吸道感染，在HIV病毒感染者身上很常见，医生在使用某些抗生素前必须对诊断结果确认无疑。

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A new law specified that houses must be a certain distance back from the water.

一项新法律详细规定了房子必须与水域相隔一定的距离。

《柯林斯英汉双解大词典》

If there is atmosphere in the passage I'm about to quote from Macbeth, it must be atmosphere of a certain kind and there for a certain reason.

如果下面这篇《麦克白》里的选段有所谓的“气氛“,那这种气氛一定因为某种原因以某种形式存在着。

耶鲁公开课 - 文学理论导论课程节选

So Nabokov imbues that state of impersonality with certain kinds of emotion and then asks the reader to be as impersonal as that modernist artist also must be.

所以纳博科夫用某些特定的情感,来营造非个人化的境界,让读者像现代主义艺术家那样非个人化。

耶鲁公开课 - 1945年后的美国小说课程节选

Thus, we must be certain the Cold War relics we keep (with their "eight-track tape" technology) function when called upon.

CENTERFORSECURITYPOLICY: Center For Security Policy

That means retirement savers who want to move assets into a Roth 401(k) account from their pretax 401(k) must be certain they can pay the taxes involved, and that they are prepared for any additional tax ramifications triggered by the temporary income bump.

WSJ: Family Value: Is It Time to Convert

But you must always be certain that you understand what your customers are really telling you before you take action.

FORBES: The Root Cause Of Your Customer's Anger