石油和天然气钻孔机可以在海平面以下数里之外传送地震冲击波，收集回声，并对该地区是否存在石油做出推理。
The oil and gas driller can send seismic waves miles under the sea floor, gather the echoes, and deduce whether petroleum might exist there.
很快，切片机、回声探测器和探鱼飞机又出现了。
Soon came filleting machines, echo-sounders and spotter planes.
本文专为迁频接收机的设计推导了在常态条件下人体中脉冲回声的频率迁移量的公式。
The chirping frequency of the pulsed echo from human tissue under normal condition is formulated. It will be helpful fort...
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