switch machine installation

例句：

1. 1.The technicians were installing the new switches in the factory.
   技术人员正在工厂安装新的开关。
2. 2. The power switch installation was a critical part of the electrical system.
   电力开关安装是电气系统的关键部分。
3. 3.The company had to replace the old switches with new ones for safety reasons.
   出于安全原因，公司不得不更换旧的开关为新的。