若某事件发生当且仅当事件A发生且事件B发生，则称此事件为事件A和事件B的交事件（或积事件）。记为A∩B或AB。
B AA ΩΩ 积事件(product event)：对于任意两 事件A和B，“A，B两事件同时发生” 作为试验的一个事件，记作A∩B，简 记为AB或A•B 。
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尤其当讨论一个男方认为有问题的事件的时候，婚前同居过的情侣更容易做出消积行为，如强迫或者控制。
In particular, when discussing a topic the husband had identified as a problem, partners who had cohabited tended to express more negative behaviors such as coerciveness and attempts to control.
项目在我桌子角落上只是积灰尘的原因是不是只因为我相信我没有事件(或者不知道如何)来完美做好它们？
Do projects sit on the corner of my desk gathering dust simply because I believe I don't have time (or don't know how) to do them perfectly?
震积岩是“灾变事件岩”的典型代表。
Seismite is a typical instance of "the rock of catastrophic event".
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