空置的频道
Vacant channel
以上为机器翻译结果，长、整句建议使用 人工翻译 。
这是因为在空中传播的高频信号中，两个模拟发射频道的之间要有一个空置的频道这样才不会干扰相邻的频道。
That was because, in over-the-air VHF broadcasting, the channel between two analogue stations had to be left unused so that it would not interfere with adjacent ones.
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