open与open up的区别

open和open up的区别 open 与open up 有什么区别阿? open ticket与 open return ticket 的区别? be open与open（s）的区别 open ticket 与 ok ticket 的区别 open与close的区别及用法 wide open 和open wide的区别 open up和open有什么区别如题 outdoor与open air区别 This door wouldn't open与This door didn't be open.的区别 begin,start,open的区别 这里open的用法i can open life up to another person.and i can open