你的文字概述了各种无线通讯媒介，如地面微波，通信卫星，蜂窝和PCS系统。
Your text Outlines a variety of wireless telecommunications media such as terrestrial microwave, communications satellites, cellular and PCS systems.
由于无线电是一个从事媒介比电视少，这可能是一个好主意。
Since radio is a less engaging medium than TV, this is probably a good idea.
在第一阶段，传播与媒介政策主要涉及的对象是新兴的电报、电话和无线电技术。
In Phase I, communications and media policy primarily referred to the emerging technologies of telegraph, telephony and wireless.
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