名词
中文翻译：指示器
同义词：
['signal', 'indicator', 'signpost']
例句：
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1.The traffic light is an important indicator ofsafety.
交通灯是安全的重要指示。
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2. Thenew product has a clear indicator of itsquality.
新产品的质量有明确的指标。
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3. The policeofficer used his flashlight as an emergencyindicator.
警察用他的手电筒作为紧急指示。