名词
中文翻译：跟踪指示器
同义词：
['tracking device', 'tracking instrument']
例句：
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1.The car's engine noise is agood indication of its health.
汽车发动机的噪音是其健康状况的良好指示。
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2. The policeused a track indicator to find the thief.
警方使用一个追踪指示器来找到小偷。
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3. The engineer used a track indicatorto measure the distance between the two points.
工程师使用一个追踪指示器来测量两个点之间的距离。