"식"

선생님 : 해사 means ceremony. It has the same meaning as 식. For example, 결혼식, 졸업식 and 입학식.

선생님 : 무슨 "식"도 있어요?

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(whisperings in the background)
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학생 : 음식 ...... 하하하

선생님 : ........