유행outbreak 한류Korean wave 교류mixture of currents; intersection of streams 대유행being widely popular; fad; craze 상류upper region 유통circulation; ventilation 유행병epidemic 유행어fad word; buzzword; in-word 청산유수fluent speech 초일류tiptop; summit

출입going in and out; entry 출입국departure; entry 입구entrance 출입coming and going 입국entering a country 입수to obtain 입구entrance; entry; gate 입원hospitalization 입장권admission ticket; entrance ticket 입학admission to a school; entrance into a school