velocity of wave group

例句：

1. 1.The wave group velocity is a crucial factor in determining the propagation speed of waves.
   波群速度是决定波传播速度的关键因素。
2. 2. The study of wave group velocity has significant implications for understanding the behavior of oceanic currents.
   研究波群速度对于理解海洋洋流的行为具有重要意义。
3. 3.In the context of seismology, wave group velocity refers to the speed at which seismic waves travel through the Earth's crust.
   在地震学中，波群速度指的是地震波在地球地壳中传播的速度。