They were sworn to secrecy.

他们被要求发誓保密。

《柯林斯英汉双解大词典》

Everyone involved was sworn to secrecy.

所有相关人员均宣誓保密。

《牛津词典》

Remember, you have sworn to tell the truth.

别忘记，你宣过誓要讲实话。

《牛津词典》

"Every member of every northern legislature, " Webster said, "has sworn to support the constitution of the United States.

VOA: special.2009.04.02

I,not they, have sworn to do impartial justice.

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"I was sworn-in one night and the next morning I had to get right to the job at hand,"

VOA: special.2011.07.28

Now they are sworn to restore the true faith and its central creed: never raise taxes.

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Many jurists, fallen sway to progressivism, find the Constitution they are sworn to uphold a hindrance.

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Those higher up the rungs appear to be treated better though they, too, are sworn to secrecy.

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