hardening

['hɑ:dniŋ]

n. 硬化法(增加硬度, 淬火, 渗碳, 锻炼)
动词harden的现在分词形式

例句与用法：

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.

窑用于加硬，燃烧或烘干物料如谷物、粗粉或粘土的各式的小窑，特指用来焙干或烧陶器的砖砌的窑

So we find that hardening operation is made up of heating and quenching.

因此我们发现淬火工序包括加热和淬硬两个步骤。

Hardening means make harder.

淬火就是促使变硬。

详细释义：

n.

1. 硬化

2. 锻炼