keep a straight face 忍住不笑出来 ; 板着脸 ; 忍住不笑
straight face 直线工祖 ; 绷着脸 ; 不露表情的脸
straight-face test 测谎考验
or keep a straight face 或者板着脸
The straight face 直脸 ; 着脸
kept a straight face 不露笑容
with a perfectly straight face 板着脸
to keep a straight face 控制自己不露笑容 ; 板着面孔
What went through Tom's mind I can't imagine, but he did manage to keep a straight face.
汤姆心里在想什么我想像不出来，但是他确实装着一脸严肃。
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。
He kept a straight face and remained speechless.
他绷着脸不说话。
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