gumeong ttulgi
drilling
perçage ; forage ; trouage
구멍 뚫기를 할 때는 안전 장비를 착용해야 합니다.
gumeong ttulgi-reul hal ttae-neun anjeon jangbi-reul chak-yong-haeya hamnida.
When drilling, you must wear safety equipment.
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