从这个意义上讲，“threshold”意味着一种临界点，就像一个开关，使得FM无线电信号从静止状态到播放音乐状态(或者，也可能是一个广告)的忽然变化。
In this sense threshold means a sort of transition point like the threshold when an FM radio signal breaks through from being just static to being music (or maybe an AD).
该系统由信号注入装置、无线节点、开关站无线处理单元和智能故障信息处理系统构成。
It is composed of a signal injection device, wireless nodes, a wireless process unit at the switch station and an intelligent fault detection system.
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