All these changes happened over a period of time.
所有这些变化都是在一段时间内发生的。
This crisis might last for a long period of time.
此次危机可能会持续很长一段时间。
Medical experts say small amounts of carbon monoxide over a long period of time can greatly harm an unborn baby.
VOA: special.2010.02.02
It began to infiltrate other disciplines and was in general a high-spirited horse for that certain period of time.
它逐渐渗入到其它学科,总之是那个时代的一匹黑马。
There was a period of time in which, although there were decent, chess-playing programs couldn't beat the best chess-playing humans.
尽管曾一度出现过,强劲的象棋程序,无法战胜顶级人类棋手的情形
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