closure theorem

例句：

1. 3.
   建筑物等的
2. 1. The door is closed and locked from the inside.
   门从里面锁上了。
3. 2. The factory has been sealed off due to a gas leak.
   由于气体泄漏，工厂已被封锁。
4. 3. The room was closed for renovations.
   房间因装修而关闭。