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。

youdao

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。

youdao

All the circulating water heater, heat radiator, circulating pump and water replenishing system are contained together via pipeline.

循环水加热器和散热器及循环泵装置、补水系统通过循环管配管。

youdao