parallel-series switch

例句：

1. 1.The parallel-series switch is used to control the flow of electricity in a circuit.
   平行系列转换开关用于控制电路中的电流流动。
2. 2.The parallel-series switch was designed to improve efficiency and reduce power consumption.
   平行系列转换开关被设计用来提高效率和减少电力消耗。
3. 3.The parallel-series switch is an essential component in many electrical systems.
   平行系列转换开关是许多电气系统中不可或缺的一部分。