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。

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Among these Gardner's motivation theory emphasizes the influence of integrative motivation on language learning and has much impact on the afterwards researches.

其中，语言学习社会教育动机理论强调融入型动机对语言学习的作用，对第二外语学习动机的研究影响深远。

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Context theory emphasizes the importance of context in language teaching and learning.

语境理论则强调语境在语言学习中的重要性。

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But the reality is that many parts of the brain work together to produce speech and no single gene, region of the brain or theory can explain successful language-learning.

ECONOMIST: What makes some people learn language after language?