出现故障的硬件需要修理或更换；软件需要应用补丁、更新和升级；必须根据需求和潜在的安全威胁提前配置系统。
Hardware failures demand repair or replacement; software requires patching, updates, and upgrades; and systems must be configured to keep ahead of demand and potential security threats.
修理：使背景更新按钮不清楚。
本文研究了由一个部件和一个修理工组成的检测更新模型。
This paper considers a inspection renewal model consisting of one component and a single repairmen.
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