名词
中文翻译：硬化碳
同义词：
['hardened carbon', 'hardened carbon material']
例句：
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1.The steel was hardened to increase its strength.
钢材被硬化以提高其强度。
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2.The hardened carbon is used as a lubricant in the machine.
硬化的碳用于机器中的润滑剂。
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3. The hardened carbon is resistant to wear and tear.
硬化的碳具有抗磨损性。