词典释义：
双语例句
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A flash mob is a large group of people who assemble suddenly in a public place, perform an unusual action for a brief time, then quickly disperse.
一群互不相识的人，透过因特网相约在指定时间和地点集合，然后一起做出一些无意义的动作，例如拍手掌、叫口号等。