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1·There are three sub-systems in Appraisal Theory—Attitude, Engagement and Graduation.

他们认为，评价系统包括三个部分：态度、介入、级差。

2·All the sub-system of Appraisal, namely Attitude, Engagement and Graduation contribute to the formation of the writers' attitude and position.

评价系统的三个子系统，态度，介入和级差都参与作者态度与立场的形成。