traveling-wave ratio

例句：

1. 1. The traveling wave propagates throughthe medium at a speed that depends onthe properties of the medium.
   旅行波在介质中传播的速度取决于介质的性质。
2. 2. The travelingwave is a type of oscillationthat travels through a medium.
   旅行波是一种通过介质传播的振荡形式。
3. 3. The travelingwave ratio is used to measure the efficiencyof a transmission line.
   旅行波比值用于测量传输线路的效率。