keep a straight face造句

1、It was hard to keep a straight face while I answered their questions.
回答他们的问题时，真叫我忍俊不禁。

2、It was hard to keep a straight face while I answered their questions
回答他们的问题时，真叫我忍俊不禁。

3、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。

4、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。

5、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。

keep a straight face翻译