1.occur vi.發(fā)生,出現(xiàn)
解析：【同】happen,take place
【衍】occurrence n.發(fā)生
【辨析】happen強(qiáng)調(diào)偶然性
There happen to be no money with me.
It so happens that...
take place指有計(jì)劃的使某事發(fā)生
Great changes have taken place in my hometown.
occur則包括了以上二者的意義,比較含糊.
2.occur是一般用詞,可指某事情偶然發(fā)生或者按照計(jì)劃進(jìn)行,在表示具體失去的名詞作主語(yǔ)的時(shí)候,可與happen換用,但比較正式,跟to短語(yǔ)時(shí),表示“想到”,而不是“發(fā)生”,比如
I’m very sorry for all happened to you.
An idea occurs to me that going to Switzerland for traveling will be marvelous!