straight face

音标发音

“Our engineers know how to work without electricity,” says a national phone company's boss, with a straight face.
“我們的工程師知道如何在無電的情況下工作，”一家全國電話公司老板板著臉說道。
“Our engineers know how to work without electricity, ” says a national phone company’s boss, with a straight face.
一國營手機公司的老板，一臉平靜的說，我們的工程師知道如何無電工作。
With a straight face, Iran’s representative endorsed the ringing declarations about strengthening nuclear safeguards, while also helping block moves that would have made tougher rules mandatory.
伊朗的代表繃著一張臉，支持關於加強核安全保障的強有力宣言，同時也有助於阻止強制制定更加嚴格的條款的擧動。

Climbers have to pull themselves straight up the face of very high rocks or walls.
That permits people to cite it as a model with a straight face eight decades after it was enacted?
讓人們引以爲典範,以嚴肅的態度認爲,即使這個新政已是八十年前的事情了？
斯坦福公開課 - 經濟學課程節選
and swung right into the straight face of the cliff and
直接撞上了峭壁，
攀巖的刺激 - SpeakingMax英語口語達人

Quite how anyone could suggest this with a straight face I am not sure.
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a serious expression on your face that you use when you do not want someone to know that you think something is funny