By seeing how in or out of phase two light waves  are, an observer can infer the relative speed of the waves.

通过观察两个波的同相或异相，观察者可波的相对速度。

The gravity waves moving through the inversion  created enough lift that a strong updraft was formed and it moved in phase with the peak of the  gravity wave.

通过反转的重力波产生了足够的升力，形成了强大的上升气流，并且与重力波的峰值同相移动。