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1·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。《柯林斯英汉双解大词典》

2·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。

3·He kept a straight face and remained speechless.

他绷着脸不说话。《新英汉大辞典》

4·I kept a straight face as long as I could, but I finally had to crack up.

我尽量板着面孔，但最后还是控制不住失声大笑起来。《新英汉大辞典》

5·I Tried tp keep a straight face.

试着摆出一张严肃的脸。

6·She said it with a straight face.

她板着脸说了这件事。

7·Dont keep a straight face.

别板着脸吓唬我。

8·Judges love to keep a straight face.

法官喜欢保持一张正直的脸。

9·I could hardly keep a straight face.

我几乎忍不住笑出来。

10·I found it hard to keep a straight face.

我要装出一副严肃的面孔很难。