名词
中文翻译：难熔渣
同义词：
['insoluble slag', 'incombustible slag']
例句：
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1. The refractoryslag is difficult to melt andrequires special handling.
这种难熔渣很难熔化，需要特殊处理。
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2. Thefurnace was filled with refractory slag, making it difficult for the workersto work.
炉内充满了难熔渣，使得工人难以工作。
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3. Therefractoryslag was used as abuilding material, providing a strong anddurable structure.
这种难熔渣被用作建筑材料，提供了坚固耐用的结构。