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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·I Tried tp keep a straight face.

试着摆出一张严肃的脸。

4·Dont keep a straight face.

别板着脸吓唬我。

5·Judges love to keep a straight face.

法官喜欢保持一张正直的脸。

6·I could hardly keep a straight face.

我几乎忍不住笑出来。

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

我要装出一副严肃的面孔很难。

8·Stop joking around. I'm trying to keep a straight face.

别闹了，我正试着要板着面孔。

9·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。

10·When Bob fell into the water, he looked funny and I could hardly keep a straight face.

鲍布掉入水中时，看起来很滑稽，我几乎禁不住笑出来。