Don't set your car's air conditioner or heater to recirculated air. Selecting the outside air option on your dashboard will reduce the number of pollutants you're circulating inside the car.
不要用汽车空调或加热器去循环空气，将操控仪表板选至外部空气会降低内部循环时产生的污染物。
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This article derives a general model of heater for thermal dynamic system. Based on the general model, the thermal parameters of regenerating system can be calculated by Circulating Function Method.
文章在建立了热力系统加热器的通用性数学模型的基础上，用循环函数法对整个回热系统进行热力计算。
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All the circulating water heater, heat radiator, circulating pump and water replenishing system are contained together via pipeline.