名词
中文翻译：Unknown
同义词：
['natural graphite', 'native carbon']
例句：
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1.This type of graphite is commonly used in the production of pencils and pens.
这种类型的石墨常用于制造铅笔和钢笔。
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2.The graphite was extracted from ancient volcanic rocks.
石墨是从古代火山岩中提取出来的。
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3. Native graphite is a valuable resource for industrial applications.
原生石墨是工业应用的重要资源。