occur作“发生、想到、突然想起”解,其意义相当于happen,例如：What has occurred?(=What has happened?) A big earthquake occurred (=happened) in the south of China last month.It occurred to me that she didn’t know I had moved into the new house.(4).come about表示“发生、产生”,多指事情已经发生了,但还不知道为什么,常用于疑问句和否定句,例如：When Mother woke up,she didn’t know what had come about.I’ll never understand how it came about that you were late three times a week.Do you know how the air accident came about?
come about与OCCOUR的区别和用法