以下为句子列表：
英文: The result shows that the existence of a protecting skullwith low thermal conductivity between hot metal and brick layers is the same essence of prolonging the life of hearth bottom, and the disadvantages of the two kinds of hearth bottom were analyzed.
中文: 指出在铁水和耐火材料之间低导热系数的“保护壳”存在，是不同设计延长炉缸炉底寿命的相同本质，并分析了这两种结构的炉缸炉底的不足。
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