[04:22.22]如果有必要就改变人造卫星的方向.
[04:25.80]Satellites for broadcasting
[04:27.87]人造卫星为广播
[04:29.95]are used to send radio
[04:34.10]and TV programmes from one part of the world to another.
[04:37.22]通常把无线电通信和电视节目从世界的一边发送到另一边.
[04:40.35]Most of these satellites do no
