Definition: a machine that heats air or water Level: B1
冬天，我们依靠电暖气来保持房子温暖。
In winter, we rely on an electric ___heater to keep the house warm.
我决定买一张新地毯和一个小暖气。
I have decided to buy a new carpet and a little ___heater.
办公室有一个中央暖气，为所有房间提供温暖。
The office has a central ___heater that provides warmth to all rooms.
