一定频谱范围内的无线电波只能搭载有限的广播频道；同轴电缆只能传 输有限的电视频道。
The radio spectrum can carry only so many stations, and a coaxial cable so many TV channels.
同轴电缆-一种应用在宽带数据和有线电视系统中的电缆，它具有非常优良的宽带频率特性，能消除杂音且有物理耐久性。
Coaxial cable - a type of cable used for broadband data and cable systems, with excellent broadband frequency characteristics, noise immunity and physical durability.
同轴电缆最初即为视频传输所设计，在家中有电视的地方就能找到它的出口。
Coax was originally designed for video and outlets are generally found where you watch TV.
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