1.引言二语学习研究1(second language learning)兼具促进二语学习理论发展和指导实践教学的双重意义(Ellis 2008;Gass&Mackey 2012)。国内外研究者们从多个研究视角对二语学习的理论机制进行了阐释,但由于二语习得本身的多面性和复杂性,二语习得研究仍缺乏理论体系的统整。在这种情况下, 1. Introduction Second language learning 1 has the dual meaning of promoting the development of SLT theory and guiding practical teaching (Ellis 2008; Gass & Mackey 2012). Domestic and foreign researchers have explained the theoretical mechanism of second language learning from multiple perspectives, but due to the multifacetedness and complexity of second language acquisition, the study of second language acquisition lacks the theoretical system integration. under these circumstances,