名词
中文翻译：Unknown
同义词：
['refining', 'forging']
例句：
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3. 例句：1. The steel is being melted in a furnace.
钢正在炉中熔化。
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2. The iron ore was heated to produce the molten metal.
铁矿石被加热以产生熔融金属。
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3. The process of smelting is essential for the production of steel.
炼钢过程对于钢铁生产至关重要。