名词
中文翻译：指示针
同义词：
['indicate', 'indicator']
例句：
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1.The engineer used a pointer to indicate the correct answer on the board.
工程师用指针在黑板上指出正确的答案。
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2.The doctor indicated that she needed more rest.
医生表示她需要更多的休息。
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3. The scientist used an indicator to measure the concentration of pollutants in the air.
科学家使用指示剂来测量空气中污染物的浓度。