Charles Darwin developed the theory of how living things develop from simpler organisms over long periods of time.

VOA: special.2009.02.25

So, the process of developing a vaccine occurred over a long period of time.

疫苗的发展经历了很长一段时间

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Now,that has changed, for sure; but,the centralization of the French government and the domination of Paris over the life of the nation is very difficult to change, over a long period of time.

现在,情况已经发生了改变,但是法国政府的中央集权化,以及巴黎在国民生活中的支配地位,在相当时间段内,都很难得以改变

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The apartheid government over a long period of time and the atrocities being documented over a long period of time caused many around the world to call for divestment in South Africa, the imprisonment of Nelson Mandela, et cetera.

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The primary result they determined was that over the long periods of time, all of the different strategies performed about the same.

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Only longitudinal studies that follow the economic lives of the same people over long periods of time have the power to reveal the true nature of income inequality, along with the various factors that cause some people to be more economically successful than others.

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