indicator [ˈɪndɪkeɪtə(r)]

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n.指标；指示物，指示者；指示器

something that shows what a situation is like

Gold prices are often seen as an indicator of inflation. 黃金价格常常被看作是通货膨胀的指标。
His left-hand indicator is flashing. 他左手边的转向灯正在闪亮。