급감rapid decrease; sharp fall; nosedive 급증rapid increase 급행열차express train 긴급emergency 긴급회의emergency meeting 응급실ER; emergency room 초특급being very speedy 특급special express 화급urgency; emergency 구급relief; rescue

강제coercion 강제성forcibleness 격일제alternating days system 순번제rotating system 시간제being by the hour 예약제subscription basis 월급제monthly pay system 제도institution; system 제약constraint 제한limit

자동차automobile 자동문automatic door 자동automatic 동력motive power 행동action; movement behavior; deed 동물animal 동물원zoo 운동exercise 운동복sportswear; sweat suit 운동장playground; sports field