• 1. idle time cost: 停工时间成本 | 无效工时成本
• 2. cost of idle time: 浪费时间成本

• 1.Likewise, finalizers are normally processed as a background task, so their cost is usually amortized across the system's idle time.
  同样，终结通常是后台任务，所以它们常常在系统的空闲时间执行。
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