anneal

动词 anneal:

1. toughen (steel or glass) by a process of gradually heating and cooling
   同义词：temper, normalize

1. Anneal means make harden steel soft and remove brittleness.
   退火就是使淬火钢变软并消除其脆性。

an.neal

v.（动词）
an.nealed,an.neal.ing,an.neals
v.tr.（及物动词）
To subject (glass or metal) to a process of heating and slow cooling in order to toughen and reduce brittleness.
使退火：给（玻璃或金属）加热并使之慢慢冷却以使之变硬并减少易碎性
To strengthen or harden.
使坚强，使变硬
v.intr.（不及物动词）
To become strengthened or hardened:
加强，变硬：
例句：
.the time she needed for opinion to anneal around her policy.(Alexander M. Haig, Jr.)
.她需要时间来加强她对政策的看法.(小亚历山大M.黑格)

来源：
Middle English anelen
中古英语 anelen
from Old English onôlan [to set fire to]
源自 古英语 onôlan [给…放火]
on [on] * see on
on [关于，在] *参见 on
ôlan [to kindle]
ôlan [点火，激起]