small single-phase transformer

例句：

1. 1. The small single-phase transformer is used to convert alternating current into direct current.
   小型单相变压器用于将交流电转换为直流电。
2. 2. The small single-phase transformer was designed to meet the needs of a small power station.
   小型单相变压器被设计来满足小功率电站的需求。
3. 3. The small single-phase transformer is an essential component in the electrical system.
   小型单相变压器是电力系统中不可或缺的组成部分。