Parvaneh tried to keep a straight face.

帕尔瓦娜强忍着不笑出声。

" His finest hour, " said Fred, unable to keep a straight face.

“那是它最辉煌的时刻。”弗雷德说，脸上忍不住要笑。

How Harry managed to keep a straight face during these performances is quite beyond me.

我实在想像不出哈里在这些表演中是怎样装出一本正经的样子的。

But fathers and mothers! He shook his head. You can't expect me to keep a straight face about fathers and mothers.

可是那些‘爸爸’呀，‘妈妈’呀，他摇摇头。在那些‘爸爸’、‘妈妈’面前你就无法叫我板着面孔。

Her mother tried to keep a straight face.

她的母亲试图保持板着脸。

Well, they said they didn't need to keep a straight face for long.

好吧，他们说他们不需要长时间保持板着脸。

I found it very difficult to keep a straight face.

【straight】我觉得很难板住脸不笑。

Luckily, we didn't need to keep a straight face for long.

幸运的是，我们不需要长时间保持板着脸。

Nothing, I said, trying to keep a straight face. There's nothing funny. Nice jumper.

没什么，我说，尽量保持板着脸。没什么好笑的。漂亮的毛衣。

" To keep a straight face" (straight) – a straight face means not to smile, not to laugh.

“to keep a straight face” （直）——板着脸的意思是不笑，不笑。

The question is, " continued Alvin, struggling to keep a straight face, " WHO is the Heir to Stoick the Vast?

问题是，" 阿尔文勉强板着脸继续说，" 谁是史托伊克大帝的继承人？

When Jamie started growing that tuft of orange hair, it was hard to keep a straight face to be fair. Because we all found that hilarious.

看着杰米开始长出一撮橙色的头发老实说，要保持严肃的面部表情可太困难了。因为我们都觉得那一段太滑稽了。

Well, the reason they didn't need to keep a straight face for long – for a long time – or for much longer, is that their dates arrived.

好吧，他们不需要长时间保持板着脸的原因——很长一段时间——或者更长时间， 是因为他们的约会对象到了。

'Please excuse Louisa Clark from today's lessons as I am very poorly with women's problems.' Dad had struggled to keep a straight face even while he was supposed to be tearing a strip off me.

“请原谅 Louisa Clark 今天的课程，因为我对女性问题的理解很差。”爸爸努力保持板着脸，即使他本应从我身上撕下一条裙子。