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She made a solemn promise to him when they became engaged that she would give up cigarettes for good.

他们订婚时，她向他许下郑重的承诺，说她会永远戒烟。

《柯林斯英汉双解大词典》

I made a solemn promise that I would return.

我郑重承诺我会回来的。

《牛津词典》

When you sign on to a job on the board, you are signing on to a solemn responsibility and that responsibility is to treat all shareholders equally and fairly and make money for them.

如果你签订协议进入董事会,你就承担起一份庄严的责任,它就是,平等对待所有股东,努力为他们赚钱

耶鲁公开课 - 金融市场课程节选

Justice will be done for those whose lives have been upended by this disaster, for the families of those whose lives have been lost -- that is a solemn pledge that I am making.

WHITEHOUSE: President Obama Assesses BP Oil Spill Response

Mary's Church of the Assumption that held a solemn first Mass since the blast.

NPR: Prayer And Waiting In Texas Town Rocked By Blast

Either way, a photograph from that time shows a skinny, solemn child atop her charge with the same ease with which one claims one's place on the living-room sofa.

WSJ: A Horse-Crazy Girl's Separation Vacation