功能语法认为语域、语言功能和语法成分具有三元一体的关系。

Functional Grammar holds that there exists a trinity relationship among context, function and language choices.

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元话语的多种功能是由不同类别的元话语标记语来实现的。

All these functions of metadiscourse are realized in the text by different types of metadiscourse markers.

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Somebody says, "What is a mare?" "Well, it's a female horse." "Well, it's a female horse" is the metalingual function.

有人问“什么是母马“，“母马就是雌性的马“,“母马就是雌性的马“这句话就是元语功能。

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