indicator

indicator
noun

a thing, especially a trend or fact, that indicates the state or level of something
指示物，标志物
car ownership is frequently used as an indicator of affluence.
拥有小汽车常常被看作是富裕的标志。
a device providing specific information on the state or condition of something, in particular
提供某物状态或状况详细信息的装置，尤指
■[usu. with modifier]a gauge or meter of a specified kind
量表，仪表
a speed indicator.
示速器。。
■(Brit.)a board or screen in a railway station, airport, etc. giving current information
(英)（火车站、飞机场等的）信息显示板，信息显示屏
■a flashing light or (formerly) other device on a vehicle to show that it is about to change lanes or turn
（车辆的）方向灯，（旧时）转向（或转道）指示器
(Chemistry)a compound which changes colour at a specific pH value or in the presence of a particular substance, and can be used to monitor acidity, alkalinity, or the progress of a reaction
(化)指示剂
(亦作 indicator species)an animal or plant species which can be used to infer conditions in a particular habitat
（用来帮助判断栖息地环境状况的动、植物）指示种群，指示植物，指示动物

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