動(dòng)詞 anneal:

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

1. Anneal means make harden steel soft and remove brittleness.
   退火就是使淬火鋼變軟并消除其脆性。

an.neal

v.（動(dòng)詞）
an.nealed,an.neal.ing,an.neals
v.tr.（及物動(dòng)詞）
To subject (glass or metal) to a process of heating and slow cooling in order to toughen and reduce brittleness.
使退火：給（玻璃或金屬）加熱并使之慢慢冷卻以使之變硬并減少易碎性
To strengthen or harden.
使堅(jiān)強(qiáng)，使變硬
v.intr.（不及物動(dòng)詞）
To become strengthened or hardened:
加強(qiáng)，變硬：
例句：
.the time she needed for opinion to anneal around her policy.(Alexander M. Haig, Jr.)
.她需要時(shí)間來加強(qiáng)她對(duì)政策的看法.(小亞歷山大M.黑格)

來源：
Middle English anelen
中古英語 anelen
from Old English onôlan [to set fire to]
源自 古英語 onôlan [給…放火]
on [on] * see on
on [關(guān)于，在] *參見 on
ôlan [to kindle]
ôlan [點(diǎn)火，激起]