medium-sized blast furnace(Figure 6 is a diagram of a medium-sized blast furnace which would be about 30 metres high and 10 metres diameter at its widest part. 图 6 是一幅中型高炉图，炉高约 30m, 最宽处直径 10m。)
throat-bell height(Throat-bell height refers to the vertical distance between the upper termination of the throat section and the bottom of the large bell when closed. 炉喉-料钟间高度指的是炉喉上沿至大料钟关闭位置的下沿之间的垂直距离。)
blast furnace A tall, cylindrical smelting furnace for reducing iron ore to pig iron; the blast of air blown through solid fuel increases the combustion rate(一个高大的为减少铁矿石冶炼生铁的圆柱形炉；吹入空气来增加固体燃料的燃烧率。)
