Research into so-called 'extinction events' for our planet over the past 500 million years - twice as long as any previous studies - has proved that they crop up with metronomic regularity.

科学家研究了过去5亿年间地球上发生的所谓的“灭绝事件”，时间跨度是先前任何一项研究的两倍。此次研究证实大灭绝的出现是有时间规律的。

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All of us have to learn to deal with difficult situations when they crop up.

我们所有人都必须学会处理突然出现的困难情况。

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Rather than spending a lot of energy trying to power on through these situations, focus on coming up with ways to deal with them before they crop up next time.

更确切地说，应该花费大量的精力，通过这些情况，努力去促进自己，集中精力找到办法，下次在这些情况意外地出现前解决它们。

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Windows Phone also takes care of most of the interface slowdowns that often crop up with typical low-end phones.

ENGADGET: IRL: Moshi's Digits gloves and the Nokia Lumia 620 on Telus

The same problem will crop up with home 3-D.

FORBES: Get Ready to Buy Your Own 3-D Glasses

The results are so bad that they call into question Big Pharma's ability to come up with a new crop of cholesterol blockbusters.

FORBES: Magazine Article