Impacts by meteorites represent one mechanism that could cause global catastrophes and seriously influence the evolution of life all over the planet.

陨石的撞击代表了一种可能导致全球性灾难并严重影响地球上所有生命进化的机制。

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States or conditions are added to the horizontal lifelines to represent changes in states or conditions over time.

状态或者情况会添加至水平生命线以代表状态或者情况随着时间所发生的变化。

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Skeptics say these machines do not represent a great improvement over video teleconferencing.

怀疑论者表示，这些机器不能代表超越视频会议的重大进步。

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The decline in revenues in developed economies, which represent over two-thirds of the advertising market, will continue to put pressure on advertising stocks.

FORBES: Double-Dip Recession? Advertising Stocks Say So

These estimates represent year-over-year growth of 14.1% for 2012 and 12.1% for 2013.

FORBES: Taubman Centers Riding The REIT Rebound

These estimates represent year-over-year growth of 19.4% for 2012 and 14.2% for 2013.

FORBES: Down From Highs, V. F. Corp. Looks Sharp