名词
中文翻译：指示钟
同义词：
['indicator bell', 'indicator bell signal', 'indicator bell signal device']
例句：
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1. The indicating bell is used to alertthe driver of an approaching vehicle.
指示钟用来警告驾驶员前方有车辆接近。
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2. Theindicating bell was a crucial part of theold-fashioned alarm system.
指示钟是老式警报系统的重要组成部分。
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3. Theindicating bell was replaced bya digital display after the oldsystem failed.
在旧系统失效后，指示钟被数字显示屏所取代。