tempering
/ˈtempərɪŋ/ 25improve 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。
单词造句: