투자investment 투표vote; ballot; poll 투고unsolicited submission; unsolicited contribution 투고란reader’s column page 투구throwing a ball; pitching; thrown ball 투기speculation 투기성being speculative 투망casting a net 투매sacrifice sale; dumping 투사shooting; throwing

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