closed connected bucket chain

例句：

1. 1.The door is closed, please wait outside.
   门已关闭，请在外面等待。
2. 2. The factory is closed for maintenance.
   工厂因维修而关闭。
3. 3.The room was closed off from the rest of the house.
   房间被从房子的其他部分隔离开了。