变流器

例句：

1. 1. The transformer is used to step down the voltage for power distribution.
   变压器用于将电压降低以进行电力分配。
2. 2. The transformer is essential for maintaining the proper voltage levels in our homes.
   变压器对于保持我们家中适当的电压水平至关重要。
3. 3. The transformer was designed to improve the efficiency of our electric grid.
   变压器被设计来提高我们电网的效率。