Then when they stand up and face the crowds, there's a big smile.

但当他们面对人群站立时，他们露出了大大的微笑。

耶鲁公开课 - 心理学导论课程节选

But it was a big, fake smile, the Pan Am smile, a smile to communicate "hello" and but it's as opposed to a smile where the communication is that of genuine happiness.

但那是大大的，虚假的微笑，泛美式微笑，微笑意味着你好,但与微笑截然相反,交流时微笑是真正开心的。

耶鲁公开课 - 心理学导论课程节选