look it up 和 look up it有什么区别啊怎么用?

look up和look look up it 还是look it up look it up Look it up!翻译 look up look up look up look up look it up 和 look up it有什么区别啊怎么用? look up to和look down LOOK和LOOK UP有什么区别? stay up,look up , put it down 与put down it 的区别,还有look it up和look up it的区别. look up to和look up into有什么区别 为什么说look it up 却说look for it 为什么说 look it up 而不说look it for look it up 和look up it 的区别?谁能帮忙解释解释啊 ? 谢了啊 look up/look forward to