On some systems the time is a true count of milliseconds, changing approximately every millisecond.

在一些系统上，时间是真正的毫秒计数，大约每一毫秒改变一次。

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However, some researchers believe that a GRB was responsible for the Ordovician mass extinction approximately 450 million years ago.

然而，有一些研究者认为，大约4.5亿年前的奥陶纪大灭绝是伽马射线爆引起的。

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At some regular interval, approximately every 3 hours, Google Analytics processes the data in the logfile.

以一定的间隔周期，大约每3个小时，Google分析处理日志文件中的数据。

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The eBooks business which was non-existent till some years ago is now a multi-billion dollar business for Amazon and is growing at approximately 70% annually.

FORBES: Amazon's Third Party Sellers Drive Margins And Stock Higher

Slumdog Millionaire's slum-dwellers represent approximately 60% of Mumbai's population who live in the shantytowns and slums - some would say they are the foundation of Mumbai city life.

BBC: Mumbai: India's Tinseltown

However, our preliminary estimate -- based on information in our 2003 Report to Congress and some limited follow-up with agencies -- is that approximately 55 (about 35%) of these nominations have resulted in agency action.

WHITEHOUSE: Testimony of John D. Graham