상하up and down 상수tap water 세상world 영상temperature above zero 탁상시계table clock 향상improvement; enhancement; progress 사상being in history 상good; top 상급반upper grades; higher grades 상급생senior student; upper classmen

상하up and down 하수sewage 하숙비payment for board and lodgings 영하temperature below zero 지하basement 지하도underground tunnel 지하철subway 지하철역subway station 하bottom; lowest 하강fall; descent

수력hydropower 산수landscape 식수drinking water 하수sewage 상수tap water 호수lake 수Wednesday 수영swimming 수영복swimsuit; bathing suit 수영장swimming pool

태권도taegwondo; taekwondo 편도one-way 횡단보도crosswalk; crossing 도morality; principle 도로road 지하도underground tunnel 하수도sewerage 효도filial piety 검도kendo 다도art of ceremonial tea-making