名词
中文翻译：预熔炼同义词
同义词：
['preheating', 'pre-melting']
例句：
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1. Before the main melting process begins, we need to perform a presmelting step.
在主要熔化过程开始之前，我们需要进行一个预熔炼步骤。
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2. During the presmelting stage, the temperature of the material is increased gradually.
在预熔炼阶段，材料的温度逐渐增加。
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3. The presmelting process helps to remove impurities and improve the quality of the final product.
预熔炼过程有助于去除杂质并提高最终产品的质量。