名词
中文翻译：石墨球状物
同义词：
['graphite', 'graphite rock', 'graphite powder']
例句：
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1. Thegraphite nodule is a valuable resource for the mining industry.
石墨球状物是采矿业的宝贵资源。
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2.The graphite nodule was discovered in the deep seabed.
石墨球状物在深海床被发现。
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3. The graphite nodule is used in the production of pencils and pens.
石墨球状物用于生产铅笔和钢笔。