indicator

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
   同义词：index, index number, indicant
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

1. He talks about economic growth as a great indicator for freedom, I agree with him.
   他论及经济增长是自由的一个有力的显示器，我同意。
2. An indicator or a sighting apparatus on a plane table, used in angular measurement.
   旋标装置飞机控制板上的指示器或观测仪，用来测量角度
3. A hand-held, button-activated input device that when rolled along a flat surface directs an indicator to move correspondingly about a computer screen, allowing the operator to move the indicator freely, as to select operations or manipulate text or graphics.
   鼠标一种手用的、用按扭控制的输入设备，当在平台上滑动时可以相应地移动计算机屏幕上的指示箭头，使得操作者可以随意控制指示箭头，由此来选择项目、控制内容或作图

in.di.ca.tor

n.Abbr. indic.（名词）缩写 indic.
One that indicates, especially:
指示者：尤指起指示作用的人
A pointer or an index.
指示：箭头或索引
An instrument used to monitor the operation or condition of an engine, a furnace, an electrical network, a reservoir, or another physical system; a meter or gauge.
指示器，记录器：监控发动机、熔炉、电网、水库或其它系统运作状况的仪器；指示板或仪表盘
The needle, dial, or other registering device on such an instrument.
指针：这些仪表上的针、盘或其它指示用工具
Chemistry Any of various substances, such as litmus or phenolphthalein, that indicate the presence, absence, or concentration of another substance or the degree of reaction between two or more substances by means of a characteristic change, especially in color.
【化学】 指示剂：任何一种具有下列功能的物质，即能通过自身性质的变化，特别是颜色的变化来表明另一种物质的存在、消失或聚集，或可以表明两种以上的物质相互反应的程度；例如石蕊、酚酞
Any of various statistical values that together provide an indication of the condition or direction of the economy.
指标：任何一个统计数值，这些数值综合在一起能表明经济的状况或经济发展方向