noun ダウンロード 🔗共有 教科書、テキスト 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. " 学生は授業初日の前に教科書を買う必要があります。 education writing literature AIとチャット語彙ゲーム読解練習