Mandarin is the most common language of Shanghai, but John has learned only a few courtesy expressions.
普通话是上海最常用的语言，但是约翰只学会几句礼貌用语。
Smile is a kind of language that represents kindness, friendliness, courtesy and consideration.
微笑是一种语言，它代表了友善、亲切、礼貌、关怀。
Lett us act, that everyone is consciously using the language of courtesy and manners.
让我们行动起来，人人都来自觉地使用文明礼貌语言。
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