/'ɪndɪkeɪtə(r); `ɪndə,ketɚ/
n
1 person or thing that points out or gives information (eg a pointer or needle on a machine showing speed or pressure, etc) 指示者; 指示器; 指针
*Litmus paper can be used as an indicator of the presence of acid in a solution. 石蕊试纸可用以测试溶液是否含酸.
2 board giving up-to-date information about times of arrival or departure of trains, aircraft, etc （表示火车、飞机等往来时刻的）指示牌
*a `train indicator 列车时刻指示牌
* an ar`rivalsindicator 到达时刻指示牌.
3 device (esp a flashing light) on a vehicle showing that it is about to change direction （车辆的）方向指示装置（尤指闪动的灯光）
*a `traffic-indicator 方向指示器
* His left-hand/right-hand indicator is flashing. 他的左[右]信号灯在闪动. =>illus at App
1 见附录1插图, page xii.

n[C]
something that can be regarded as a sign of something else
　All the main economic indicators suggest that trade is improving.
fog lamp, headlight, indicator, mirror
BrE one of the lights on a car that flash to show which way the car is turning
American Equivalent: turn signal
a pointer on a machine that shows the temperature, pressure, speed etc