jack door

例句：

1. 1. The jack door is the only way out of this room.
   杰克门是这间房间的唯一出口。
2. 2. He opened the jack door to let some fresh air in.
   他打开了杰克门，让一些新鲜空气进来。
3. 3. The jack door was a surprise when we discovered it.
   当我们发现杰克门时，它是个惊喜。