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case·hard·en AHD[kāsʹhär'dn] D.J.[ˈkeɪsˌhɑːdn]K.K.[ˈkesˌhɑrdņ]v.tr.（及物动词）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.表面渗碳硬化法：通过高温条件下对碳的浅层注入并紧接冷却来使（铁或钢的）表面或外壳硬化
- To make callous or insensitive.使冷漠或不敏感
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