Register theory is a very important theory in functional grammar.

语域理论是功能语法的一个重要理论。

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Register theory is one of the important theories in systemic-functional grammar.

该理论是系统功能语法的重要理论之一。

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Register Theory describes the language variables at different settings of speaking and writing.

语域的概念是指我们所说的和所写的随情景类型不同而改变的情况；

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When the stockmarket fell (as it did), so the theory goes, the portfolio investors would pile in, see Hong Kong shares climb again, and register a tidy capital gain before their year-end performance review.

ECONOMIST: South-East Asia��s currencies are not safe yet