母线

例句：

1. 1. The power grid is the main source of electricity in our area.
   电力网是我们地区的主要电力来源。
2. 2. The engineer designed a new circuit board to connect all the components.
   工程师设计了一个新的电路板，将所有组件连接起来。
3. 3. The substation serves as the main line for the transmission and distribution of electricity.
   变电站是电力传输和分配的主干线路。