There is one more U.S. television network I want to talk about that has many different broadcast stations affiliated with it, or connected with it, which is " PBS, " the Public Broadcasting System.

还有一个我想谈的美国电视网络，它有许多不同的广播电台附属于它，或者与之相连，那就是“PBS”，即公共广播系统。

At the most basic level, your router is essentially just a tiny radio broadcast station — except that it's using frequencies in the microwave range, which is a little bit higher on the electromagnetic spectrum.

在最基本的层面上，您的路由器本质上只是一个微型无线电广播站——除了它使用微波范围内的频率， 该频率在电磁频谱上稍高一些。