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。

youdao

youdao

youdao

People now use poker face in everyday speech to describe someone who shows no emotion.

VOA: special.2009.11.22

And if you use this little magnet you can draw a mustache or hair, or eyebrows or whatever on this particular face.

如果你想使用这小磁铁,就可以画个小胡子,或者头发或者眼眉等。

哈佛公开课 - 计算机科学课程节选

You can also turn this on its face a little bit and use this to ask a question.

你也可以对这个句型稍微做一下变形，用作疑问句。

It seems 课堂 - SpeakingMax英语口语达人

Nearly half of U.S. men don't use face wash or a moisturizer, according to Unilever research.

WSJ: Dove Men+Care Face Products: Behind the Ad Campaign

Ministers are planning to use face, iris and fingerprint scans to identify people.

BBC: NEWS | UK | UK Politics | Kennedy urges ID card opposition

Nearly two dozen pieces of enchanted art throughout the boat use face-recognition software to prevent delivering the same animation twice in a row.

BBC: Keeping Disney magic afloat