case.hard.en

v.tr.（及物動(dòng)詞）
case.hard.ened,case.hard.en.ing,case.hard.ens
To harden the surface or case of (iron or steel) by high-temperature shallow infusion of carbon followed by quenching.
表面滲碳硬化法：通過(guò)高溫條件下對(duì)碳的淺層注入并緊接冷卻來(lái)使（鐵或鋼的）表面或外殼硬化
To make callous or insensitive.
使冷漠或不敏感