In advanced stage of English language learning,students would meet witmany difficulties in understanding English in the original.Traditionaltranslation method fails to help students to overcome these difficulties,forin translation,they might give a word-for-word version.Translation inmother tongue is able to pour the surface meaning into students’brains,butit is not able to build a bridge from the surface meaning to the implicationin deep structures,and the original language materials can hardly be explo-ited to improve students’command of expression techniches.To avoid the