Because of the limitation of grammar method and logic category, language itself has to construct a more flexible mechanism.

为了弥补语法手段与逻辑范畴的局限性，语言自身不得不建构一套更加富有弹性的机制。

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The method starts by making use of well-established linguistic data on words and grammar within these language families, and building "family trees" of those languages.

BBC: Language universality idea tested with biology method