noun 다운로드 🔗공유 교과서, 학습서 A coursebook, a formal manual of instruction in a specific subject, especially one for use in schools or colleges. Examples : "Students need to buy their textbooks before the first day of class. " 학생들은 수업 첫날 전에 교과서를 사야 합니다. education writing literature AI와 채팅어휘 게임독해 연습