In the course of language communication, therefore, a discourse can show different meanings and functions under different contexts.

因此在语言交际过程中，语篇在不同的语境中就会表现出不同意义与功能。

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Register is variety of language in situational context which consists of three variables: field, tenor and mode. They have some restrictive functions on discourse comprehension.

语域即由情境变化而产生的语言变体，由话语范围、话语基调和话语方式三个变项构成，对英语语篇理解起着重要的制约作用。

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