mining area main substation

例句：

1. 1.The mining area main substation is located in the heart of the city.
   矿区主变电站位于市中心。
2. 2.The main substation controls the power supply to the entire mining area.
   主变电站控制整个矿区的电力供应。
3. 3. The mining area main substation was built to improve the efficiency of the mining operation.
   矿区主变电站的建设目的是为了提高采矿作业的效率。