There are a lot of mode wave patterns near P-wave velocityline in 2-D spectrum, which have dense special distribution and large amplitude when the radial thickness of model well is thicker ;
当模型井的径向厚度较大时，二维谱中纵波速度线附近的模式波类型较多，空间分布较密集，幅度也较大；
2
The velocity will become more accurate on its own—no need for special post-facto adjustments to bring it into line.
速率自己会变得更加准确——没必要事后去做调整，让它与实际一致。
3
Well, at point P, the velocity vector QP is perpendicular to the line QP, 1 so the sine of that angle is one.