double-armature relay

例句：

1. 1.The double-armature relay is used to control the flow of electricity.
   双极继电器用于控制电流的流动。
2. 2.The double-armature relay is an essential component in many electrical systems.
   双极继电器是许多电气系统中不可或缺的组件。
3. 3. The double-armature relay was developed to improve the efficiency of power distribution.
   双极继电器的发明是为了提高电力分配的效率。