对事件的独立性、互不相容性进行了剖析，并讨论了独立性、互不相容性与零概率事件的关系。
This paper analyzes the events independences and incompatibility, and discusses some relations among independence, incompatibility and null events.
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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