卫星为相距遥远的地区通过微波提供通讯线路。要在人口密集区间传输电视信号需大容量线路。
Satellites provide communication circuits between widely separated locations via microwaves. To transmit television signals between population centres requires high-capacity circuits.
卫星为相距遥远的地区通过微波提供通讯线路。要在人口密集区间传输电视信号需大容量线路。
Satellites provide communication circuits between widely separated locations via microwaves. To transmit television signals between population centres requires high-capacity circuits.
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