noun 다운로드 🔗공유 석탄 덩어리 A mass of coal holed or undercut so as to be thrown down by wedges. Examples : "The miners carefully prepared the jud of coal for blasting. " 광부들은 폭파를 위해 석탄 덩어리를 조심스럽게 준비했다. material geology industry work AI와 채팅어휘 게임독해 연습