happen to 与 occur to 的具体意思,以及两者的区别是什么?

happen to 与 occur to 的具体意思,以及两者的区别是什么? occur to和happen to的区别 occur happen的区别 come about,occur to,bring in与happen的区别及意义 happen,take place与occur 的区别 happen to 与happen to have done 的区别是什么? occur to /happen to come to sb与occur to sb的区别? occur,happen,take place,hold的区别 happen 有 sth happen to sb或者sb happen to do sth 那么occur同样的用法吗 befall和happen to的区别是什么? happen with和happen to的区别