克拉申指出，在语言学习过程中，语言输入和语言习得机制起着同等重要的作用。
Krashen points out that language input plays an identical part with language Acquisition Device in language learning process.
它是多个学科与理论流派思想观念的融合，其核心要素在于探索语言学习的外部社会文化机制。
It is combination of opinions from many subjects and theories and focuses on exploring external social-cultural mechanism of language learning.
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