power down feed

例句：

1. 1.Please power down the computer before we leave.
   在我们离开之前，请先关闭电脑。
2. 2.The power outage caused a lot ofproblems for the city.
   停电给城市带来了很多问题。
3. 3. We need to turn off thelights before leaving the room.
   在离开房间之前，我们需要关掉灯。