It is proven that when you smile you are more attractive to someone.

事实证明微笑能让你更有吸引力。

youdao

I've seen you cry and I've seen you smile.

我见过你哭泣的样子，也见过你微笑的样子。

youdao

Oh, you needn't smile--I reckon I can show you.

噢，你们不必笑——我想我可以让你们看看。

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

Within 20 degrees of separation from you initial smile to the three people, the entire world will be smiling.

只需要20度的分隔,从你用笑容感染三个人开始，全世界就会笑起来。

哈佛公开课 - 幸福课课程节选

If you try to imagine a smile with no body at all, it can't be done. Why?

如果你要相信一个没有身体的微笑,那是根本做不到的 为什么呢

耶鲁公开课 - 死亡课程节选

If this movie doesn't make you smile you may not know how.

CNN: Review: 'A Bug's Life' hits a bulls-eye

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

FORBES: When You're Smiling

Even worse, you can find a B:I soundtrack on iTunes but only the familiar versions of the songs, and not the did-I-really-just-hear-that, head-turning versions that make you smile when you recognize them in their unfamiliar arrangements.

FORBES: Irrational Games Makes Serious Misstep with 'BioShock: Infinite' Soundtrack Offering