keep a straight face 忍住不笑出来 ; 板着脸 ; 忍住不笑 ; 不苟言笑 or keep a straight face 或者板着脸 ; 或扳起面孔 to keep a straight face 控制自己不露笑容 ..
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or keep a straight face
或者板着脸
以上为机器翻译结果，长、整句建议使用 人工翻译 。
We often keep a straight face or use an unsmiling expression when we're making a joke.
当我们开玩笑的时候，我们经常绷着脸或使用不笑的表情。
youdao
At any hour, day or night, there is a Republican on TV complaining with a straight face that Al Gore will keep demanding recounts until he has enough votes for victory.
CNN: Why Gore Has the Right to Fight
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