名词
中文翻译：Unknown
同义词：
['1. spark extender']
例句：
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3. spark counter例句：1. The spark protractor is used to measure the duration of an electrical spark.
火花延长器用于测量电火花的持续时间。
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2. The spark protractor was used to test the accuracy of the timing device.
火花延长器被用来测试计时设备的准确度。
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3. The spark protractor was used to measure the distance between two points on a circuit.
火花延长器被用来测量电路上两点之间的距离。