closing of switch

例句：

1. 1. The power switch was accidentally turned off by a child.
   一个孩子不小心把电闸关了。
2. 2. The engineer had to switch the machine on again after it shut down unexpectedly.
   机器突然停止工作后，工程师不得不重新开启它。
3. 3.The car's engine is now running smoothly, thanks to the quick switch-off and restart.
   由于迅速的关闭和重新启动，汽车现在运行得很平稳。