'출석하다'는 학교의 클라스처럼 꼭 참여해야 하는 경우에 많이 쓰고, '참석하다'는 결혼식이나 자유로운 사교 모임 따위에 자진해서 (voluntarily) 참여하는 것을 말해요. - 내일은 특별 수업이 있는데 모두 출석해야 해요 = We'll have a special class tomorrow, which everyone is required to attend. - 시민센터의 완공식에 많은 저명인사가 참석했다 = A slew of dignitaries were present at the completion ceremony of the Citizens' Center.

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