열fever 열기heat; hotness 열기구hot-air balloon 열애ardent love 열정passion 열중absorption; immersion 체열body heat 태양열solar heat 해열reducing fever; alleviation of fever 해열제fever reducer

효과effect; efficacy 효과적being effective; being effectual 효과적effective; effectual 효율적being efficient; being effective 효율적efficient; effective 비효율적being inefficient 비효율적inefficient 특효special efficacy 특효약miracle cure; wonder drug 효과음sound effect

청취율ratings 할인율discount rate 환율exchange rate 효율적being efficient; being effective 효율적efficient; effective 감소율reduction ratio 비율ratio; proportion 비효율적being inefficient 비효율적inefficient 사망률death rate