人们常常假设，但没有证据证明，在所谓的“大迁移”中，大多数移民来自农村地区，这是由两个同时发生的因素推动的。

It has been frequently assumed, but not proved, that the majority of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors.

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这件事几乎是与那件事同时发生的。

This event was almost simultaneous with that one.

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简而言之，羽毛的进化史是伴随着飞行的进化同时发生的。

In short, the evolution of feathers would have happened along with the evolution of flight.

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That's why your operating systems and your personal computers often crash for no apparent reason. Just because two things happen to, once in a while, occur at the same time.

这就是为什么你的电脑或者操作系统,经常会毫无预兆的崩溃了,这是因为两件事情正好同时发生了，通常还有人工输入。

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That says that if you have independent probabilities, then the probability of two events is equal to the product of their probabilities.

意思是,几个相互独立的事件,其中两个事件同时发生的概率,等于他们分别发生的概率的乘积

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But in the real world that's a sequential game, people decide to run in some order, we're going to assume this is all simultaneous.

但在现实生活中这是个有顺序的博弈,人们依照某种顺序决定是否参选,我们将假设这全是同时发生的

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