toroidal transformer

例句：

1. 1.The toroidal transformer is used in power systems to convert AC to DC.
   环形变压器用于电力系统中将交流电转换为直流电。
2. 2.The toroidal transformer is an essential component of the power grid.
   环形变压器是电网中不可或缺的组成部分。
3. 3. The toroidal transformer was designed to improve efficiency and reduce noise.
   环形变压器的设计旨在提高效率并减少噪音。