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.
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释义
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。
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