upper conductor

例句：

1. 1. The upper conductoris responsible for transmitting signals to thelower layers of the system.
   上导体负责将信号传输到系统的下层。
2. 2. In apower grid, the upper conductor carriesthe highest voltage and is protected by thegrounding wires.
   在电力网中，上导体承载最高电压，并被接地线保护。
3. 3. The upper conductorwas damaged during the storm, which causeda short circuit in the entire network.
   暴风雨期间，上导体受损，导致整个网络发生短路。