我们通过声带(由此而命名)发出声音，这种笑通常是自然而本能地发出的。
We create the sound with our vocal chords (hence the name), and usually laugh this way naturally and spontaneously.
你能从一大群游客中轻而易举地把美国人认出来，只要看看他们脸上那出于本能的咧嘴笑就知道了。
You can pick out the Americans in a crowd of tourists by their reflexive grins.
当一群人笑的时候，人们会本能地去看那群人中让他们觉得最亲近的人。
When a group of people laugh, people will instinctively look at the person they feel closest to in that group.
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