translation.en: So they bought a scanner. These are perfectly legal and they run at the frequency of the P25, and what they did is they hopped around frequencies and they wrote software to listen in.
translation.zh: 他们买了一个扫描仪。这些都是完全合法的 他们并在P25的频率下运行这扫描仪， 之後他们在这个频率周围不停地转动 然後用他们所写的软件来监听。