heavy duty switch machine

例句：

1. 1. This heavy duty switch machine is designed for industrial use.
   这款重型开关机是为工业用途设计的。
2. 2. The heavy duty switch machine was installed in the factory to ensure safety.
   这款重型开关机在工厂安装，以确保安全。
3. 3. The heavy duty switch machine was used to control the flow of materials in the factory.
   这款重型开关机被用来控制工厂中物料的流动。