금강석diamond 보석jewel 비석tombstone; monument 석류pomegranate tree 석유oil; petroleum 일석이조killing two birds with one stone 초석cornerstone; foundation stone 치석tartar; scale; plaque 타산지석learning from someone else's mistakes; lesson from someone else's failures 탄생석birthstone

공장factory 공작craftwork 수공handcraft 공부study 공장factory; plant 시험공부cramming for an examination 가공성processability 가공식품processed food 가공품processed goods 공대생engineering student