According to the study, two factors were important for lake formation in the Empty Quarter: first the rains that fell there were torrential.

根据这项研究，有两个因素对“空白之地”湖泊的形成很重要：首先，那里的降雨十分猛烈。

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There were actually two periods of rain and lake formation: the first one began about 37,000 years ago; and the second one dates from about 10,000 years ago.

事实上，这里有两个时期的降雨和湖泊形成：第一个始于大约37000年前；而第二个可以追溯到约一万年前。

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I think it is still unclear whether black holes play any role in the formation of the first galaxies.

我认为到底黑洞在最初的星系形成过程中扮演什么样的角色，这仍然是不清楚的。

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Scholars have proposed three possible models to explain the formation of Israel. The first is an immigration model.

学者们提出了三种可能的模型,来解释以色列的形成，第一种是移民模式。

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In 1979 pathologist Ross Gerrity showed that in pigs one of the first steps in the formation of artery plaque occurs when macrophages travel into the artery and gobble up cholesterol inside, forming fatty deposits.

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The first time a play, formation or strategy is used, it can create a big element of surprise.

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