indicator
US /ˈɪn.də.keɪ.t̬ɚ/
UK /ˈɪn.də.keɪ.t̬ɚ/

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方向燈, 指示燈
a flashing light on a vehicle that tells other drivers which way the vehicle is turning
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Don't forget to use your indicator when turning.
轉彎時別忘了打方向燈。
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The car's left indicator is not working.
汽車的左方向燈不亮。