历史语言学的研究还可以使我们对非语言的因素，如社会文化和心理因素等在语言变化过程中所起的作用有更深的认识。

The historical study of language also enables us to determine how non-linguistic factors, such as social, cultural and psychological factors, interact over time to trigger linguistic change.

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这本书涵盖了第二语言的研究，包括社会学，心理语言学和语言的角度等一系列领域。

The book covers a range of areas of second language research including sociolinguistic, psycholinguistic, and linguistic perspectives.

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社会语言学是研究语言与社会之间的连系的语言学分支。

Sociolinguistics is the branch of linguistics which deals with the link between language and society.

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