名词
中文翻译：自由碳
同义词：
['free carbons', 'free carbonaceous material']
例句：
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1. The research onfree carbon is of great significance to the development of new energy sources.
对自由碳的研究对于新能源的开发具有重要意义。
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2. Free carbon can be used as a catalyst in chemical reactions.
自由碳可以作为化学反应的催化剂。
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3.The production of free carbon is a key step in the process of producing graphite.
自由碳的生产是生产石墨过程中的关键步骤。