名词 indicator:

1. a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time

2. a signal for attracting attention

3. a device for showing the operating condition of some system

4. (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction

indicatorn.指示器；指示剂；指示牌；【统计学】指标；【计】指示符indicator base碱性指示剂indicator drum指示器卷筒indicator card指示器卡片indicator disc指示盘indicator face指示器表盘indicator cock示功器旋塞indicator gate指示器闸门,指示器门电路,显示选通门indicator cord指示表拉绳indicator clip指示器固定簧片indicator-on指示指令接通

1. Health indicators are the building blocks of the health monitor.
   健康状况指示器是健康监视器的基础。
2. The operator is alerted to this situation by blinking front-panel indicators.
   面板上的指示器将出现闪光，对操作者发出出现这种情况的警告。