He seemed a part of the darkness and silence of the forest, for no one had ever known him to smile or speak an unnecessary word.

VOA: special.2011.02.26

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

For instance, there's been research finding that people in England smile different from people in the United States.

例如，研究发现,英美人的微笑不同。

耶鲁公开课 - 心理学导论课程节选

for his new album,Sara Smile. But,it's the album's title track that has special meaning to Jimmy.

VOA: standard.2009.12.30

There is some evidence for a third sort of smile.

有证据表明有第三类微笑。

耶鲁公开课 - 心理学导论课程节选

We know, for instance, that young children smile.

我们知道，例如，小孩子微笑。

耶鲁公开课 - 心理学导论课程节选