1、It was hard to keep a straight face while I answered their questions.
回答他們的問(wèn)題時(shí)，真叫我忍俊不禁。

2、It was hard to keep a straight face while I answered their questions
回答他們的問(wèn)題時(shí)，真叫我忍俊不禁。

3、It was difficult to keep a straight face when he fell over the dog
當(dāng)他絆著狗摔了一跤時(shí)，大家很難扳著臉不笑。

4、We often keep a straight face or use an unsmiling expression when we're making a joke.
當(dāng)我們開(kāi)玩笑的時(shí)候，我們經(jīng)常繃著臉或使用不笑的表情。

5、It was difficult to keep a straight face when he fell over the dog.
當(dāng)他絆著狗摔了一跤時(shí)，大家很難扳著臉不笑。

keep a straight face翻譯