其中单频网技术的关键问题主要包括单频网的网络规划、单频网的组网模式、覆盖重叠区的接收性能以及单频网中的节目分配网络等等。
The key issues of single frequency network technology includes network planning, networking mode, performance of overlapping coverage of the reception area, and program distribution network and so on.
此后每一组，两个圆圈开始相互覆盖直到在最后一组中几乎重叠。
With each new set, the circles begin to overlap until they are nearly on top of one another.
尝试根除互相重叠和覆盖的规则甚至是一项更加劳动密集的任务。
Trying to root out rules that overlap and override each other is even a more labor-intensive task.
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