主要介绍：随机事件与概率教学中的事件的互逆与互不相容；
The thesis includes five teaching parts:The Wutual Converse of Probability and Non-existence of two Probablities at the same time;
引入了随机物元的概念，建立了随机事件的物元模型，提出了可拓数学中可拓事件与可拓概率的概念。
The concepts of the random matter elements, the matter element models of the random events and the concepts of extension events and extension probability in extension mathematics are introduce.
概率论与数理统计的研究对象是随机现象，而随机事件及其概率是概率论与数理统计的基础。
Random phenomena are the object of study of probability theory and mathematical statistics, and random matters and their probabilities are the basis of probability theory and mathematical statistics.
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