语言输入理论是第二语言习得研究的重要理论之一。

The input hypothesis is one of the most important theories in the study of second language acquisition.

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克拉申的语言输入理论被应用于词汇习得，词汇附带习得理论也因此而产生。

Krashen's Language Input Hypothesis is applied in vocabulary acquisition and thus incidental vocabulary acquisition theory comes into being.

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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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