在程序组织上采用两级管理的模块式结构，便于修改和逐步扩充系统的功能。
The system consists of a sequence of functional modules which are independent of each other, so it can be modified and extended easily.
在程序组织上采用两级管理的模块式结构，便于修改和逐步扩充系统的功能。
The system consists of a sequence of functional modules which are independent of each other, so it can be modified and extended easily.
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