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| Chinese | English |
| 炉顶三角区 | roof delta (The center section of the roof which surrounds the electrode ports is called the roof delta and is a cast section of refractory which may be water cooled. 环绕电极孔的炉顶中心区称为炉顶三角区，由耐火材料浇筑而成并可以进行水冷。) |
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| Chinese | English |
| 炉顶三角区 | roof delta (The center section of the roof which surrounds the electrode ports is called the roof delta and is a cast section of refractory which may be water cooled. 环绕电极孔的炉顶中心区称为炉顶三角区，由耐火材料浇筑而成并可以进行水冷。) |