默多克的嘴角又浮现出那个不出声的笑，喉咙深处哼一声。
Murdoch's mouth made the shape again, and a slight hissing sounded in the back of his throat.
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.
人类可能是唯一能笑出声音来的动物，可实际上，喜欢笑（但笑不出声来）的动物并不少。
Humans are the only creatures that crack jokes, but lots of animals like to laugh.
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