A flashmob is a group of people who come together suddenly in a public place, do something unusual for a short period of time, and then quickly break up.
快闪族,是指一群人突然在公共场所聚集,在短时间内做一些不寻常的事情,然后迅速散开。
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Youth activists, meanwhile, organised a flashmob in a House office building today.
与此同时,年轻的积极分子们今天在众议院的一幢办公楼内组织了一次快闪行动。
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This was the first case of the globally renowned "FlashMob" landing in Changchun, China.