갑문: 갑문 [閘門] [물문] a floodgate; a penstock; a sluice (gate); (운하의) a lock gate.
갑사: 갑사 [甲紗] [품질이 좋은 사] fine (silk) gauze[gossamer].
갑론을박: 갑론을박 [甲論乙駁] arguments pro and con; the pros and cons. ~하다 argue back and forth; argue[discuss] the pros and cons . 회의는 ~으로 결론이 나지 않았다 The meeting was a seesaw battle of arguments for and against wit