在第二语言习得研究领域，颇有影响的当数美国语言学家克拉申提出的输入理论。
In the study field of SLA, the Monitor Model put forward by Krashen is an important and influential theory.
文章客观地介绍了美国语言学家克拉申教授在80年代初期提出的“语言输入说”的主要观点及其理论基础。
This paper first presents the main viewpoints and theoretical foundation of the input hypothesis put forward by S. Krashen, American linguist in early 1980's.
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