metal-enclosed high voltage switch- gear

例句：

1. 1.The new metal-enclosed high voltage switch-gear has greatly improved the efficiency of our power system.
   新型的金属封闭式高压开关设备大大提高了我们电力系统的效率。
2. 2.The engineers carefully installed the metal-enclosed high voltage switch-gear to ensure safe operation.
   工程师们仔细地安装金属封闭式高压开关设备，以确保安全运行。
3. 3. The metal-enclosed high voltage switch-gear is a critical component in the electrical grid, ensuring that power transmission anddistribution are smooth and reliable.
   金属封闭式高压开关设备是电网中的关键组件，确保电力传输和分配的平稳可靠。