系统必须处理三类外部实体：生产线上的称重机、工人的控制台、审计日志。
The system must deal with three classes of external entities: the weighing machines on the production lines, the worker's console, and the audit log.
系统必须处理三类外部实体：生产线上的称重机、工人的控制台、审计日志。
The system must deal with three classes of external entities: the weighing machines on the production lines, the worker's console, and the audit log.
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