secondary spherical wave

例句：

1. 1. The secondary spherical wave is responsible for the propagation of light in the atmosphere.
   次级球面波负责光在大气中的传播。
2. 2. In the study of radio waves, the secondary spherical wave is a critical concept.
   在无线电波研究中，次级球面波是一个关键概念。
3. 3. The secondary spherical wave has been observed to travel faster than the primary wave.
   观察到次级球面波的传播速度比主波快。