名词
中文翻译：回声计
同义词：
['echo meter', 'echo gauge', 'echo detector']
例句：
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1.The echo meter is used to measure the distance between two points on a sound wave.
回声计用于测量声波上两点之间的距离。
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2. The echo meter can detect the presence of obstacles in the path of an aircraft.
回声计可以检测飞机航线上的障碍物。
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3. The echo meter was used to study the properties of water molecules.
回声计被用来研究水分子的性质。