heating surface area

例句：

1. 1. The new model hasa larger heating surface area than the oldone.
   新款模型的加热表面积比旧款大。
2. 2. The heating system needs tobe optimized for better efficiency.
   加热系统需要优化以提高效率。
3. 3. The engineer calculated the heatingsurface area of the furnace.
   工程师计算了炉子的加热表面积。