Manned "stationary" satellites are used to relay and broadcast electromagnetic communication signals.
“固定不动的”人造卫星被用来转播及广播电磁通讯信号。
2
The concert was broadcast by relay.
这场音乐会是实况转播的。
3
Based on the concepts of broadcast channel and multiple access channel, a novel half-duplex relay strategy was proposed, and optimal resource allocation under this strategy was investigated.