一、前言以往国内外的外语教学理论过于重视母语与外语进行比较的重要性,忽略了由于思维和概念系统的不同所引起的迁移。实际上,母语的思维和概念系统在二语习得过程中是客观存在的,学习者在这一过程中能否形成外语思维并彻底摇脱母语的概念系统一直都是各有争议的问题。最近一些研究表明, I. Preface The past theories of foreign language teaching both at home and abroad place too much emphasis on the comparative importance between mother tongue and foreign language, ignoring the migration caused by the difference of thinking and conceptual system. In fact, the native language thinking and conceptual system are objective in the process of second language acquisition, and it is always a controversial issue whether the learner can form the conceptual system of foreign language and thoroughly shake off his mother tongue in the process. Some recent studies have shown that,