这一发现引发了显而易见并且令人不安的问题：你能通过锻炼，例如奔跑数小时，产生过量‘诺金’来催生全部蛋白吗？

This finding raises the obvious and disturbing question: can you overdose on Noggin by, for instance, running for hours, amping up your production of the protein throughout?

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美国处理飞行计划的电脑系统星期四出现故障，导致许多航班被取消及数小时的延误。

A problem in the computer system that collects airline flight plans from across the United States caused widespread flight cancellations and hours of delays Thursday.

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自上世纪八十年代初达到顶峰后，人工流产率已呈逐年下降：现每1000位女性的人工流产数已低于20。

Since a peak in the early 1980s, the rate has dropped steadily: there are now less than 20 abortions for every 1,000 women.

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