该理论是系统功能语法的重要理论之一。
Register theory is one of the important theories in systemic-functional grammar.
同任何一种理论一样，系统功能语法也有其局限性，存在着有待进一步解决的问题。
As any other theory, it also has its own limitations and problems to be solved.
同任何一种理论一样，系统功能语法也有其局限性，存在着有待进一步解决的问题。
As any other theory, it also has its own limitations and problems to be solved.
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