名詞 hardening:

1. abnormal hardening or thickening of tissue
2. the process of becoming hard or solid by cooling or drying or crystallization
   同義詞：solidifying, solidification, set, curing
3. the act of making something harder (firmer or tighter or more compact)

動詞 harden:

1. become hard or harder
   同義詞：harden, indurate
2. make hard or harder
   同義詞：harden, indurate
3. harden by reheating and cooling in oil
   同義詞：temper, harden
4. make fit
   同義詞：season, harden
5. cause to accept or become hardened to; habituate
   同義詞：inure, harden, indurate

1. Any of various ovens for hardening, burning, or drying substances such as grain, meal, or clay, especially a brick-lined oven used to bake or fire ceramics.
   窯用于加硬，燃燒或烘干物料如谷物、粗粉或粘土的各式的小窯，特指用來焙干或燒陶器的磚砌的窯
2. So we find that hardening operation is made up of heating and quenching.
   因此我們發(fā)現(xiàn)淬火工序包括加熱和淬硬兩個步驟。
3. Hardening means make harder.
   淬火就是促使變硬。

hard.en.ing

n.（名詞）
The act or process of becoming hard or harder.
硬化：變硬或變更硬的動作或過程
Something that hardens, as a substance added to iron to yield steel.
硬化劑：如加在鐵上使其形成鋼的硬化性物質(zhì)
Gradual exposure of plants to cold weather.
把植物逐漸暴露在冷天氣下的過程