Despite his disappointment, he managed a smile, ie succeeded in smiling.

他尽管很失望, 还是强颜欢笑。

I cannot stand the TV host's plastic smile.

我不能忍受那个电视节目主持人不自然的笑容。

Don’t look so blue smile!

别这样愁眉苦脸的，笑一笑嘛!

He looked at us with a set smile.

他带着造作的微笑望着我们。

In the dusk I saw her smile, that incredible female smile.

暮色中我看见了她在微笑，那种不可捉摸的女人的微笑。

As soon as he saw her smile he knew he was off the hook.

他一看到她的微笑,就知道没事了。

I could not but smile to hear her talk in this lofty strain.

我听她这样的大口气禁不住笑了。