名词
中文翻译：淬火
同义词：
['hardening', 'tempering']
例句：
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1. The steel was hardened and tempered to increase its strength.
钢材经过硬化和回火以提高其强度。
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2. The metal is hardened by heating it to a high temperature.
金属通过加热到高温来硬化。
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3. The process of hardening and tempering is crucial for the final properties of the material.
硬化和回火过程对材料最终性能至关重要。