pyomyeon gyeonghwa
surface hardening
durcissement de surface
표면 경화는 금속의 내구성을 향상시키는 방법입니다.
pyomyeon gyeonghwa-neun geumsok-ui naeguseong-eul hyangsang-sikineun bangbeob-imnida.
Surface hardening is a method to enhance the durability of metals.
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