A flash mob 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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After a short period of break, I chose a short cut to catch up with my fellows.

稍作休息之后，为了赶上同伴我选择了一条捷径。

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With a very busy period behind me I am now wrapping up my desk before a Christmas break.

过了一段马不停蹄的日子后，我终于开始整理办公桌上的东西准备圣诞长假了。

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Temperatures in the Arctic are now even higher than they were then, and a period of renewed ice shelf break-up has ensued since 2002.

BBC: Major ice-shelf loss for Canada

Freeze dates are defined as the observed period when a lake or river was completely ice-covered, and break-up dates as the last ice break-up seen before the summer open-water phase.

BBC: Ice records reveal warming trend