The result, once natural selection had done its work over the course of millions of years, was the now familiar cast of Allosaurus and Tyrannosaurus rex.

结果，历经数百万年间的自然选择，形成了我们今日熟知的异特龙和雷克斯霸王龙族群。

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Once the auditing period is over, the audit file can be converted from its native, raw format into a readable text file.

审计结束后，便可以将审计文件从它本地的原始格式转换成一种易读的文本文件。

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Once a Web service is selected, how do you maintain the relationship over the lifetime of its use?

一旦选择了一个Web服务，在其使用生命周期内，您怎样维持这种关系呢？

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Black holes are believed to be so dense that not even light can escape their gravitational pull once it crosses over its theoretical border, known as the event horizon.

CNN: Black holes in a new light

Once Diablo III got over its initial launch issues with Error 37, PC gamers have been generally happy with the gameplay.

FORBES: Connect

And once the war was over, its borders were simply moved west by treaty.

ECONOMIST: The Poles bargain with Europe