Therefore, for the third occurrence of this event, the number of previous occurrences is two.

因此，对于该事件的第三个实例，先前的实例数量为2。

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Once an unheard-of event, it has now become a common occurrence.

一个曾经前所未闻的事件，现在却已成为一个普遍的现象。

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To note the occurrence of an event.

注明一个事件的出现。

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To note the occurrence of an event.

注明一个事件的出现。

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