A large group of people who gather in a usually predetermined location, perform some brief action, and then quickly disperse.

快闪族意指一群人，在预先决定好的地点聚集，一齐作短暂的表演或动作，然后以迅雷不及掩耳的速度四散无踪。

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It should be brief, but descriptive of the action to be performed.

它应该简洁，但是描述的行为应该被执行。

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It could be a brief summary or a call for action.

你可以做简单的总结或是呼吁大家行动起来。

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But in his brief comments at the White House, he made no mention of any punitive action.

VOA: standard.2010.01.05

Unfortunately, from the brief action in the trailer, it also appears that this gorgeous vehicle in on the destructive losng end of a high-speed chase.

FORBES: What The Modern Spy Drives: BMW Hybrid Supercar

Even though it's still in the early phases of beta-testing, we were able to stop by the Moog Music factory for a closer look and a brief glimpse of the gear in action ahead of its appearance at Moogfest.

ENGADGET: Moog's LEV-96 sensoriactuator prototype wields touch control of 96 simultaneous harmonics, we go eyes-on (video)

The latest action in France follows the brief blockade of a ship carrying Cameroon timber at the Spanish port of Valencia on Saturday.

BBC: Greenpeace blockades African timber ship