如果你在微笑，看来你正在享受乐趣。

If you're smiling, Look out you're having fun!

youdao

电视机里的你在微笑，简简单单的唱着歌。

In television's you in smile, simple singing.

youdao

你在微笑的时候嘴咧的越大，眼周围的皱纹越深，你可能活的越久。

The broader your grin and the deeper the creases around your eyes when you smile, the longer you are likely to live.

youdao

You might imagine that people smile when they're happy.

你可能想象人们在高兴的时候微笑。

耶鲁公开课 - 心理学导论课程节选