Using high-speed photography, scientists have determined that there are two steps to the occurrence of lightning from a cloud to the ground.(利用高速摄影技术，科学家们已经确定了闪电从云层到达地面有两个步骤。)
Complaints seemed to be an everyday occurrence.(投诉似乎成了天天发生的事。)
The burnings have become a nightly occurrence.(这些焚车行为已经成为每夜都会发生的事件。)
One of them is a word counter, which counts for certain word occurrence in several files.(其中之一是单词计数器，它统计某一单词在几个文件中出现的次数。)
Domestic violence is a regular occurrence in some families.(在某些家庭中，家庭暴力是常事。)
Such incident is an everyday occurrence.(这种事是家常便饭。)
If this is a first or second time occurrence, let it go.(如果这是第一次或者第二次发生，不要理会。)
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。)
The occurrence of pargasite reflects the participation of the upper mantle fluids and the metasomatism.(角闪石的出现反映上地幔流体的渗透及交代作用。)
Each occurrence handles one modification to the document.(每次出现处理文档的一个修改。)
