n.发生；事件；出现
Riots are of frequent occurrence in this province. 这省经常发生骚乱。
It is more a made-up story than a real occurrence. 那是杜撰的故事，而不是真实发生的事情。
This is a rare occurrence as our climate seldom goes to extremes. 由于这里的气候很少出现极端，所以这是很罕见的情况。
n.发生的事
名词occurence的复数形式.
