keep a straight face板着脸
It was difficult to keep a straight face when he fell over the dog.
当他绊着狗摔了一跤时，大家很难扳着脸不笑。She say with a straight face she see green spacemen in the back yard.
她面无表情地说她在后院看到绿色外星人。My father never dotes on any of us. What he gives us is always a straight face.
父亲谁也不宠爱。他给我们的总是一副严肃的面孔。He has such a strange voice that it's difficult to keep a straight face when he's talking.
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