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
Abstract this system altogether divides into three sub-systems: Edition, inquiry, statistics.
中文摘要：本系统共分为三个子系统：编辑，查询，统计。
3
Firstly, the state variables of the reentry vehicle are decomposed into two sub-systems of different time scales using the singular perturbation theory.