look it up 和 look up it有什么区别啊怎么用?

look it up 和 look up it有什么区别啊怎么用? look it up与look them up有什么区别,怎么用 look it up 和look up it 的区别? LOOK和LOOK UP有什么区别? look up to和look up into有什么区别 look up it 还是look it up put it down 与put down it 的区别,还有look it up和look up it的区别. Look it up!翻译 look it up look them up还是look it up look up 和look for有什么区别 it is wise of you和it is wise for you有什么区别吗?还有是look up it还是lo