名词
中文翻译：回声信号
同义词：
['echo signal', 'echo signature']
例句：
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1.The echo-sign of the mountain range is clearly visible from the air.
山脉的回声信号在飞行中清晰可见。
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2.The scientists used the echo-sign to locate the lost satellite.
科学家们利用回声信号找到了失踪的卫星。
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3. The echo-sign was so strong that it could be heard from a distance.
回声信号如此强烈，可以从远处听到。