Such a system contains a boiler, furnace, or heat pump to heat water, steam, or air, all in a central location such as a furnace room in a home or a mechanical room in a large building.
这个系统包含锅炉，熔炉和热泵来加热水，蒸汽或空气，所有设备集中于家里的锅炉房和大型建筑的机房。
This room is as hot as a furnace.
这个房间热得像火炉一样。
这房间简直像个大火炉！
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