The researchers found that the dogs were able to pick the angry or happy face by touching a picture of it with their noses more often than one would expect by random chance.

研究人员发现，狗能够通过用鼻子触碰图片，来选择愤怒或快乐的面孔，其概率超过了人们对随机性的预期。

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Putting on a happy face not only helps us make friends but also makes us feel better.

面带笑容不仅能帮我们交朋友，还能让我们感觉更美妙。

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I'd put on a happy face, but behind the scenes, my life was in turmoil.

台前我是满脸笑容，幕后呢，我的生活却是一片混乱。

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How had she ground her teeth, and torn her hair, when she had seen his happy face as he opened the door of the lady!

VOA: special.2009.04.18

I was happy because I had at last found a way to throw my criticism of him into his face.

这让我很开心,因为终于找到对抗他的方法了。

耶鲁公开课 - 1945年后的美国小说课程节选

Gone are the old paternalists, who put a happy face on slavery to justify their power.

FORBES: 150 Years After The Emancipation Proclamation, Are We Free?

And some companies may decide it's not too late to buy a happy face by giving out bonuses.

CNN: Managers turn away from retention bonuses for Y2K

People were asked to mark a happy face or a sad face on the evaluation form, and most checked the happy one, he says.

WSJ: Can a Food for Cows Make Healthier Snickerdoodles?