在第二语言习得中，有许多有关动机的研究，其中最重要的调查之一要数加德纳和兰伯特的调查。
There have been many studies into motivation in foreign languages, and Gardner and Lambert do one of the most principal investigations.
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.
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