名词
中文翻译：指示器
同义词：
['null indicator', 'null indicator system']
例句：
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1. The null indicating double-beam system is used to measure the distance between two points on a map.
用于测量地图上两点之间的距离的指示器双光束系统。
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2. The null indicating double-beam system was developed to improve accuracy in measuring angles.
开发了指示器双光束系统以提高测量角度的准确性。
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3. The null indicating double-beam system can be used for various applications, including navigation and surveying.
指示器双光束系统可用于各种应用，包括导航和测绘。