The traditional theory of second language learning regards the learner language as one full of errors, and overemphasizes their negative effect.
传统的二语学习理论将学习者语言（过渡语）视为充满错误的语言，并且过分强调其错误的负面作用。
Second language learning strategy theory is an important theory of second language acquisition.
第二语言学习策略理论是第二语言习得的一个重要理论。
From Second Language Acquisition (SLA) perspective, we can find out that the design and construction of most English learning websites in China is still based on Krashen's Monitor Theory.
目前从二语习得理论的角度看，国内大多数英语学习网站的设计与建设仍然建立在克拉申的监察理论基础之上。
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