一项类似于埃佩里和施罗德在《社会心理学与人格科学》上发表的假说的研究要求参与者微笑，与收银员进行眼神交流和聊天。

A study similar in hypothesis to Eply and Schroder's published in Social Psychological & Personality Science asked participants to smile, make eye contact and chatwith their cashier.

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我简直遇到了整整一个社会阶层的开心的年轻女收银员，她们一边对我微笑着，一边忙着手里乏味的工作。

I had encountered a whole social class of delightful teenage cashiers, smiling at me while they went about their dreary job.

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当你对别人笑的时候，他们对你也回以微笑，这是我们经常会忽视的一个社会交流快乐之处。

One of the simple social pleasures of life, which goes almost unnoticed because it's automatic, is when you smile at someone and they smile back.

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And this is my colleague, Marianne LaFrance, who is actually not smiling in that picture but she studies smiling and smiling in adults, smiling in children, smiling across cultures, and the different social uses of smiling.

另一位是我的同事，法国人玛丽安，她在照片上没有笑,但她研究微笑，成人的微笑，孩子的微笑，文明的微笑，微笑的不同社会功用。

耶鲁公开课 - 心理学导论课程节选