centre vent

例句：

1. 1. The centre of the room is where the sofa is placed.
   房间的中心是放置沙发的地方。
2. 2. The ventilation system in this building is excellent.
   这个建筑的通风系统非常好。
3. 3. The engineer carefully centred the drill on the hole.
   工程师小心翼翼地将钻头对准孔位。