名词
中文翻译：退火
同义词：
['reheating', 'tempering']
例句：
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1. The steel was annealed to remove internal stresses.
钢材被退火以消除内部应力。
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2. The metal was tempered to increase its strength and toughness.
金属被回火以提高其强度和韧性。
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3. During the annealing process, the material is heated to a specific temperature.
在退火过程中，材料被加热到特定温度。