名词
中文翻译：回音系统
同义词：
['echo system', 'echo network', 'sounding system']
例句：
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1. The ring-down system is used to measure the speed of sound in air.
回音系统用于测量空气中声速。
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2. The new ring-down system improves the accuracy of the measurement.
新的回音系统提高了测量的准确性。
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3.The ring-down system is a crucial component of the communication system.
回音系统是通信系统的关键组成部分。