tempering
/ˈtempərɪŋ/
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improve the hardness and elasticity of (steel or other metal) by reheating and then cooling it. "the way a smith would temper a sword"
noun [具体名词] [机]回火
But tempering alone is usually not enough. 但是单纯的退火是不够的。
verb [vt. 及物动词] 调和（temper 的 ing 形式）
For flat glass, heat tempering is most often used. 对于平板玻璃，热退火是最常用的。
