The three subsystems are controlled by OSY, which also support interface between system and user, and administrate the system database.
这三个子系统都在OSY的控制之下运行，OSY还提供用户与系统的交互界面并且管理系统数据库。
The three subsystems are controlled by OSY, which also support interface between system and user, and administrate the system database.
这三个子系统都在OSY的控制之下运行，OSY还提供用户与系统的交互界面并且管理系统数据库。
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