Parvaneh tried to keep a straight face.

帕尔瓦娜强忍着不笑出声。

But honestly, I could hardly keep a straight face.

但是，坦白说，我简直很难做到不露声色。

Harry fought to keep his face straight as he emerged.

哈利直起身，努力绷住脸。

I know. And I did it with a straight face.

我知道，我卖的时候可是全程故作镇定呢。

" 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。

He rounded on the others, who were all keeping determinedly straight faces.

他转向竭力绷着脸的其他几个人。

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。

Hey...And with a straight face you're gonna tell students that America is so star-spangled awesome.

你......你还能面不改色地跟学生说美国是如此的了不起，如此的星光璀璨。

How are you saying that with a straight face? I don't know. You guys are being jerks.

你怎么做到一脸正经地鬼扯呢？我也不知道。你们俩真过分。

Her mother tried to keep a straight face.

她的母亲试图保持板着脸。