Smoking a lot of cigarettes can harm and even kill over a long period of time.

长期大量吸烟会危害身体健康，甚至导致死亡。

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After a long period, alcoholism can deteriorate the liver, the brain and other parts of the body.

长期酗酒会损害肝脏、大脑和身体其他部位。

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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。

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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

Clearly, important information is to be conveyed to students from people who settle in the fields for a long period of time.

显然，对某个领域,进行长时间研究的学者,会将重要的信息,传达给学生。

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From 1983 to the present as you just said, the economy has a long period of smooth, robust expansion interrupted by two very mild recessions.

第二时期是从1983年至今，正如你所说，经济长时间处于,平稳强健的发展状态,而只出现了两次轻度衰退。

斯坦福公开课 - 经济学课程节选

My severe highs and lows that spanned a long period of time were all red flags.

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We need a long period of essential stagnation in that industry before things can right themselves.

FORBES: Job-Killing Politicians, Modern Military Hawks, And Hapless Central Banks

Where it lapsed, in southern slaveholding colonies, a long period of economic backwardness resulted.

ECONOMIST: Creating economic wealth