The catch is that because low-frequency waves can travel great distances, when they do bounce off cavities or objects underground, they often end up far from the detection equipment at the surface.
捕捉过程是这样的，因为低频波可以传输到更远的距离，当它们遇到地下的空穴或其他物体反射回来的时候，已经距地面的接收装置很远了。
There are more and more applications of road-penetrating radar to geologic exploration, engineering quality detection, archaeology and detection of underground hidden objects.
探地雷达在地质勘探、工程质量检测、考古、地下隐蔽物的探测等方面的应用愈来愈广。
The paper reviews briefly the imaging of underground objects such as the imaging of subsurface buried pipelines, the detection underground cavities, and the prospection of gold.
本文介绍了地下物体检测和成象的一些应用：例如地下埋设管子的成象、地下洞穴检测、黄金勘探等。
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