这栋老房子的暖气管道实现了房间之间的供暖。

The heating pipes in this old house provide ___room-to-room warmth.

这个酒店的房间到房间电话系统让客人可以轻松联系隔壁房间的朋友。

The hotel's ___room-to-room phone system lets guests easily call friends in neighboring rooms.