每个人都可以成为一个好公民，因为在很多情况下，一个友好的微笑是建立一个更美好的世界所需要的全部。

Everybody can be a good citizen, because in many cases a friendly smile is all that is needed to build a better world.

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微笑是全世界通用的语言。

Smile is a universal language.

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为了迎接5月的世界微笑日，这些青少年拍下了笑脸的照片。

The teens took a photo of smiling faces to welcome World Smile Day in May.

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Try to imagine a world in which somebody's smile exists but their body doesn't.

试图想象一个世界里某人的微笑存在,而身体不存在

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One--Oh. Well, one is that smiles are universal.

微笑是世界性的语言。

耶鲁公开课 - 心理学导论课程节选