经过大量测试，一个事件发生的概率与其不发生的概率是相等的。
Over a very large number of trials, the probability of an event occurring is equal to the probability that it will not occur.
经过大量测试，一个事件发生的概率与其不发生的概率是相等的。
Over a very large number of trials, the probability of an event occurring is equal to the probability that it will not occur.
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