The input hypothesis is one of the most important theories in the study of second language acquisition.
语言输入理论是第二语言习得研究的重要理论之一。
The study of Second Language Acquisition is generally divided into three stages: Contrastive Analysis (CA), Error Analysis (EA) and Interlanguage analysis.
一般把对第二语言的研究分成三个阶段：对比分析，错误分析和中介语分析。
The study of second language acquisition is a new branch in linguistics that has come into existence in the past 20 years in the favorable setting of psycho linguistic studies.
第二语言获得研究是近二十年来在心理语言学学科背景下诞生的一个新兴的研究领域。
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