three-phase region

例句：

1. 1. The three-phase region is where the power grid is divided into three separate parts.
   三相区域是电力网被分成三个独立部分的地方。
2. 2.In a three-phase system, all the electrical devices are connected in a specific order.
   在三相系统中，所有电气设备都按照特定顺序连接。
3. 3. The three-phase motor is used to drive heavy machinery and equipment.
   三相电机用于驱动重型机械和设备。