heater hum

例句：

1. 1. The heater in the living room is not working properly.
   客厅里的加热器不工作了。
2. 2. We need to replace the heater in the garage before winter arrives.
   冬天来临之前，我们需要更换车库里的加热器。
3. 3.The heater in the kitchen is causing a lot of noise.
   厨房里的加热器发出很多噪音。