Distances were not a problem, since radio waves could travel globally at the speed of light.
Distances were not a problem, since radio waves could travel globally at the speed of light.
距离不是一个问题，自从无线电波能在世界以光速旅行。
Distances were not a problem, since radio waves could travel globally at the speed of light.
距离不是一个问题，自从无线电波能在世界以光速旅行。