每个值都与一个最低范围和状态指示器关联。
Each value is associated with a minimum range and a status indicator.
当设有下界的指示器(例如，缓存命中率指示器)的值降低时，它将标识为不健康。
Lower bounded indicators are identified as unhealthy as they decrease in value (for example, the cache hit ratio indicator).
应该求这个指示器的值，还是应该忽略。
指示器的指示字还包含一个值，当相应行不在存贮器中时，它引起硬设备或软设备中断。
The pointer to a row can contain some value which causes a hardware or software interrupt in case the row is not in memory.
浓度指示器：显示气体浓度、显示时间、显示键盘设定值等。
Density indicator: Display gas density, time and keyboard set value, etc.
浓度指示器：显示气体浓度、显示时间、显示键盘设定值等。
Density indicator: Display gas density, time and keyboard set value, etc.
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