And the geophysical methods include TSP, Ground Penetrating Radar (GPR), seismic negative apparent velocity method, HSP and so on and these method have their own advantage each other.
用于超前地质预报的物探方法主要有，TSP法、地质雷达法、地震负视速度法、陆地声纳法、HSP声波反射法等，这些方法在应用中各有所长。
Thus the negative group velocity is simply an apparent velocity as we shall show from the study of energy flow.
因此，负群速度只是表观速度，能流的研究结果也证明了这一点。
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