Then, the paper introduced the basic concepts of wireless channel transmission mechanism as well as the characteristics of radio wave propagation in underground tunnels;

然后介绍了无线信道的传播机制基本概念以及井下巷道电波传播特性；

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Then, the paper introduced the basic concepts of wireless channel transmission mechanism as well as the characteristics of radio wave propagation in underground tunnels;

然后介绍了无线信道的传播机制基本概念以及井下巷道电波传播特性；

youdao