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。
The diversion tunnel of Geheyan Project on the Qingjiang river is one of successfully excavated large-scale underground cavities in the carbonate rock regions in China at present.
清江隔河岩水利枢纽导流隧洞是我国目前在碳酸盐岩地区开挖大跨度地下洞室的成功工程之一。
The practice demonstrates that high density electrical technique could precisely predict the space distribution characteristics of complicated underground cavities, and is worth to be applied further.
实践证明，采用高密度电法能够高精度预测地下复杂采空区的空间分布特征。
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。
In the old coal mine, there are many cavities fractures, and it's large space, favourable to movement and preservation of underground water, so that become water-rich area.
煤层采空后留下的采空区，空间巨大，空隙、裂隙极为发育，为地下水的运移、储存提供了良好的场所，成为地下水富集区。
Large Numbers of cavities formed by the underground mining of metal mineral resources not only endanger the mine safety but cause great difficulties in a full recovery of the resource.
金属矿床地下开采形成的大量采空区不仅危及矿山的安全，而且对资源的充分回收造成严重的困难。
Large Numbers of cavities formed by the underground mining of metal mineral resources not only endanger the mine safety but cause great difficulties in a full recovery of the resource.
金属矿床地下开采形成的大量采空区不仅危及矿山的安全，而且对资源的充分回收造成严重的困难。
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