名词
中文翻译：回声信号
同义词：
['echo', 'reverberation signal']
例句：
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1.The echo signals from the mountain were faint but clear.
山间的回声信号微弱但清晰。
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2.The police used echo signals to track down the thief.
警方利用回声信号追踪到了小偷。
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3. The sound of the waves echoed through the valley.
波浪的声音在山谷中回荡。