By sweeping a laser along the pipe to change the local wave speed, physicists might be able to create a horizon. 将雷射沿著管路扫过，可以改变局部的波速，运用这种方式，物理学家也许可以创造出视界来。
Furthermore, the non-dimensional propagation speed of an ISW declines and the dissipation of wave energy increases as the blockage parameter increases. 随无因次障碍参数的增大，无因次波速减小，而内波的能量消散增大。
