switching packets

例句：

1. 1. The switcher-off of the power supply is a crucial step in the process.
   断电是该过程中至关重要的一步。
2. 2. The company switched to using renewable energy sources.
   该公司转向使用可再生能源。
3. 3.During the switchover, all systems were down for maintenance.
   在切换期间，所有系统都进行了维护。