尽管这种几率非常非常小，但是不寻常事件发生的概率不会是零。
The risk is exceedingly small but the probability of something unusual happening is not zero.
在这样的假设下,整个城市都被烧掉的概率,是非常非常小的
So, the probability that the whole city burns down is infinitesimally small, right?
所以它们中的每一个，找到相邻的同种分子,的概率非常小。
So every one of them is, it's very rare for one to find a neighbor of its own kind.
所以它们中的每一个，找到相邻的同种分子,的概率非常小。
So every one of them is, it's very rare for one to find a neighbor of its own kind.
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