look it up

look up it 还是look it up Look it up!翻译 look it up look them up还是look it up look it up 和look up it 的区别? 为什么说 look it up 而不说look it for 为什么说look it up 却说look for it look it up 和 look up it有什么区别啊怎么用? if you forget something you could look it up老师画的是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与look them up有什么区别,怎么用 look up和look