변경change; alteration 변동change; fluctuation 변화change 가변variability 가변성variability; changeability 가변적being variable 가변적changeable; changing; variable 개변change; reformation; renovation 격변sudden change; rapid change; violent upheaval; cataclysm 격변기period of upheaval

개혁reform; reformation 피혁hide and leather 혁대leather belt 혁명revolution 혁명가revolutionary 혁명적revolutionary 혁신innovation; reform; overhaul 혁신안innovation plan 혁신적being innovative; being progressive; being groundbreaking 혁신적innovative; progressive; groundbreaking