Smile.

　　微笑

　　... with eye contact. In a world where smart phones rule and it's not just possible, but normal, to have entire conversations without ever looking someone in the eye, it can be heart-stopping, wonderful and double-take-worthy to lock eyes with someone grinning. Happiness is contagious, and it only takes a couple facial muscles to spread it.

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　　微笑着用眼神交流。在一个智能手机统治的世界，在整个交流的过程中，连看也不看对方一眼，这样的行为不仅是可能的，也是正常的。要是看着对方咧嘴笑，就会有屏息凝气、非常奇妙的感觉。快乐是可以传染的，只需通过几个面部肌肉的运动就可以把它传播。