在具体的语言情境中，说话人从自己庞大的活用语言知识库中选用某种语体而不选用其他语体，是有其内在的心理动机的。
In a particular language context, a speaker has his own psychological motivation in his choosing from his huge bank of active language knowledge a certain type of writing for communication.
每个人都掌握了一套包含不同语体的语言体系，既个人的“活用语言知识库”。
Everybody has a language system, an individual "bank of active language knowledge", which contains a variety of types of writing.
作为一门活学活用的语言，英语始终处于变化之中。
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