Cheer up! When you smile in front of it, it will also smile at you.

振作起来！当你对它微笑时，它也会对你微笑。

youdao

When you smile at others, they'll smile at you, too.

当你对别人微笑时，他们也会对你微笑。

youdao

You're so beautiful when you smile.

你笑起来真美。

youdao

But the look on everyone's face, when you are finished and packing, it is the best smile in the world;

VOA: special.2009.03.22

And my bet also is that that sort of distinction, how much teeth you show when you smile, is the sort of thing that would show regional and country by country differences.

我打赌区别还在于，微笑时你露了多少颗牙齿，这可以看出地区和国家的不同。

耶鲁公开课 - 心理学导论课程节选

But of course, when you imagine the Cheshire Cat only having the smile there, you're still imagining the cat's lips, teeth, maybe tongue, whatever it is.

但是当然,当你想象笑脸猫只剩下微笑的时候,你仍然想象着它的嘴唇,牙齿 或许还有舌头,不管是什么

耶鲁公开课 - 死亡课程节选

But did you know that when you smile, you feel happier?

FORBES: When You're Smiling

When you smile at someone, they almost always smile in return.

FORBES: Want to Build Collaboration? Watch Your Body Language!

When you smile, you look good and feel good.

FORBES: The Untapped Power Of Smiling