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。
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.
当爆炸引起的入射冲击波触及地面时，由于波的反射便产生另一冲击波。
When the primary air blast wave from the explosion strikes the ground another blast wave is produced by reflection.
当爆炸引起的入射冲击波触及地面时，由于波的反射便产生另一冲击波。
When the primary air blast wave from the explosion strikes the ground, another blast wave is produced by reflection.
地形决定了地面电磁波反射的强弱，反射的强弱又决定了被动遥感影像的质量。
The quantity of the EM energy that reflected from the ground decided the quality of the satellite image of passive remote sensing.
地形决定了地面电磁波反射的强弱，反射的强弱又决定了被动遥感影像的质量。
The quantity of the EM energy that reflected from the ground decided the quality of the satellite image of passive remote sensing.
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