They take a solemn oath.

他们庄严地宣誓。

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I give you my solemn oath that I will do so.

我庄严发誓我会这么做。

youdao

New Year's message: no matter how precious the gift, how solemn oath not required.

元旦短信：不需要多么贵重的礼物，也不需要多么郑重的誓言。

youdao

Every U.S. government official swears a solemn oath to uphold and defend the Constitution.

CENTERFORSECURITYPOLICY: The other debate: Frank Gaffney vs. Suhail Khan

His handshake was his solemn oath.

NPR: Transcript: Cindy McCain's Speech

Ultimately, these seniors understand that shutouts and bowl games and trophies are not nearly as important as the solemn obligation, the solemn oath that they will take in just a few weeks as the newest officers in the world's finest Air Force.

WHITEHOUSE: President Obama Presents the Commander-in-Chief Trophy