英语词汇“face-harden”是什么意思，“face-harden”的读音、用法及例句翻译-烛光网

词汇	face-harden
释义	face-hard·en AHD[fāsʹhär'dn] D.J.[ˈfeɪsˌhɑːdn]K.K.[ˈfesˌhɑrdņ]v.tr.（及物动词）face-.hard.ened, face-.hard.en.ing, face-.hard.ens To harden the surface of (a metal).使（金属的）表面硬化
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