광섬유optical fiber 섬섬옥수soft hands 섬섬옥수soft hands 섬유fiber 섬유질fiber; roughage

유지keeping; maintaining 광섬유optical fiber 생계유지making a living 섬유fiber 섬유질fiber; roughage 유신reformation; the Revitalizing Reform 유지비maintenance expense 진퇴유곡dilemma

평소ordinary times 소재material 요소element; component; factor; requisite 탄소carbon 혈색소hemoglobin 형태소morpheme 화소pixel 활력소tonic; energizer; shot in the arm; refresher 효소enzyme 간소화simplification