但历史语言学的一个分支，涉及到几种不同语言的比较，或同一种语言不同阶段的比较。

But the branch of historical linguistics, involves the comparison of several different languages, or the comparison of different stages of a single language.

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它不仅适用于亲属语言内部语音、语法规则的历史比较，也适用于非亲属语言之间某些语言要素的比较。

It not only applies to historical comparison between rules of phonology and those of grammar in relative languages, but also applies to some linguistic elements beyond relative languages.

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传统理论和方法是结构主义语言学和历史比较语言学。

The traditional methods and theories are based on Structuralism and historical comparative linguistics.

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