与微波相比，毫米波的指向性更好，其探测成像可实现更高的分辨率。
Compared to microwave, millimeter-wave has good directivity and its detecting and imaging system can have higher resolution.
人工地震波、电磁波和声波的频率越高，分辨率越高，但衰减快，可探测深度也降低。
The higher the frequency of the artificial earthquake wave, electromagnetic wave and sonic wave, the higher the resolution, but the attenuation is very fast and the exploration depth is very shallow.
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