Like a tear or a smile it is but a picture of what is taking place within.

像一滴眼泪或是一个微笑，只是在内心发生的一幅图像。

youdao

Smile, it is your birthday!

笑一下，这是你的生日。

youdao

On entering the room, he seemed to hesitate; but Jane happened to look round, and happened to smile: it was decided. He placed himself by her.

他刚走进饭厅的时候，好象颇有些犹豫，增亏吉英凑巧回过头来，凑巧在微笑，他这才拿定主意，在她身边坐下。

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

A real happiness smile, what's known as a Duchenne smile, after a neurophysiologist who studied it, involves moving the eyes.

真正开心的微笑是杜乡式微笑，在一个神经心理学者研究后发现，包括眨眼睛。

耶鲁公开课 - 心理学导论课程节选

If it's a true happiness smile, that's actually bodes better for the relationship than a Pan Am, or greeting smile.

如果是一个真正开心的微笑，对这段感情来说是个好兆头,比问候式微笑好的多。

耶鲁公开课 - 心理学导论课程节选

"Like Charlie Chaplain, I'm representing a black comedy so it makes you smile and it gives you grief at the same time, " Diab said of his work.

CNN: Syrian pop artist depicts suffering with 'black comedy'

Before, it had been warm and slightly dumb, the smile of a young lady from a provincial capital, but it had become a mean, hurtful smile, and it was easy to read the resentment, rage, and envy behind it.

NEWYORKER: Clara

Sometimes it's accompanied by a smile: it's self-assertive without being confrontational.

WSJ: Yielding With a Purpose