AC three-phase three-wire system

例句：

1. 1. The AC system in the car keeps the interior cool during summer.
   汽车中的空调系统在夏天保持车内凉爽。
2. 2. The AC unit is located under the dashboard.
   空调单元位于仪表板下方。
3. 3. The AC system needs to be regularly serviced to maintain its efficiency.
   空调系统需要定期维护以保持其效率。