Keep smile while feeling down;

当难过时保持微笑；

Yes, keep smile.

对，保持微笑。

Always keep smile and eye contact, but must not be overly patronizing.

始终保持笑容和目光交流，但是一定不能过于做作。

Don't give many pain to yourself, just keep smile always on your face.

不要给自己太多的痛苦，时刻保持微笑。

I will keep smile, give the lonely some support and the hug from heart!

我要保持微笑，给寂寞的人一些依靠，给孤单的人心灵的拥抱！