为什么look up后才加imformation而refer to 不能?而且 好像只能说refer to a dictionary 不能用look up a dictionary?

look up 和look for有什么区别查电话簿，为什么用look up? 英语翻译能不能用look up?为什么? 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 set up,put up ,look up 的区别look up 为什么说The doctor looks up the girl? look up look up look up look up look up和look 为什么look up后才加imformation而refer to 不能?而且 好像只能说refer to a dictionary 不能用look up a dictionary? stay up,look up , look forward to和look up、look out分别为什么意思抓紧!急!提前谢谢了 ( )!The cars are coming.A,Look atB,Look outC,Look forD,Look up应该选哪个,为什么? look up into the sky为什么要加into? look up/look forward to Is this the very dictionary one uses to look up new words now?为什么这里用uses to look up?不用 is used to look up? look up it 还是look it up