虽然大多数致病突变在人类中发现的概率为千分之一到百万分之一，但基础突变发生的几率可能高得多。
While most disease-causing mutated are found in humans at a rate of one in a few thousand to one in a few million people, founder mutation can occur at much higher rates.
想一想这个概率：你的队伍最快的几率只有三分之一。
Think about the probability: the chances of your line being the fastest are only one in three.
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.
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