approve为及物动词时 后直接接sth.；而为不及物动词时 后要加of才能接sth. 。
这就是区别。
approve
vt.及物动词
1. 赞成,同意;赞许[W]
The professor does not approve the government's foreign policy.
那位教授不赞成政府的外交政策。
2. 批准;认可
The city council has now approved the scheme for the erection of a new public library.
市议会业已核准建造一座新的公***图书馆的计划。
vi.不及物动词
1. 赞成;赞许[W][(+of)]
I'm afraid your parents won't approve of your going there.
我担心你父母不会赞成你到那儿去。