| 提取金属 | extraction of metal (Since the earliest days of metallurgy, refractories have played a vital part in metallurgical operations, because without them it would have been impossible to use the high temperatures required for the efficient extraction and refining of metals. 自冶金业诞生之初，耐火材料在冶金生产中就起到至关重要的作用。因为如果没有耐火材料，就不可能利用必要的高温去有效提炼和精炼金属。) |
