요인factor; cause 원인cause; reason 인연relationship; connection 패인cause of defeat; cause of failure 동인motive 변인variable 사인cause of death 인과cause and effect 인과응보karma; poetic justice; retributive justice 인습적being conventional

복습review 습관habit 연습practice; rehearsal 연습생trainee; apprentice 연습장practice field; practice room 연습장exercise book 예습studying in advance 풍습manners and customs 학습learning; study 학습자learner; student