绘制声速梯度为常数时的声线，与声学有关。-Drawing velocity gradient is constant voice, and acoustic related.

水声传播衰减的射线理论传播衰减示意图，可绘制不同声源深度关于距离的声线传播图-Ray attenuation of sound propagation theory spread water attenuation diagram can be drawn in different source depth chart on sound propagation distance line