I try to smile, but nobody even knows.

我试着微笑但是无人知晓。

youdao

I got used to it, and I try to smile naturally.

我已经习惯使用它，我希望笑得更加自然一些。

youdao

I try to smile, think that will become a person who does not cry.

我努力练习微笑，以为那样就会变成不哭的人。

youdao

And if you do make me mad, I'll try to smile and everything, but if I didn't I could probably do some damage.

CNN: The Stephen King interview

' The only thing that I can do is be positive, smile, and try to win my match and try to be ready for tomorrow.

CNN: Nadal wins at French Open, then questions scheduling