先生は黒板消しを手に取り、黒板のチョークで書かれた文字を消す方法を丁寧に説明しました。
老师拿起黑板擦，认真讲解如何用黑板擦擦除黑板上的粉笔字。
The teacher picked up the blackboard eraser and carefully explained how to use the blackboard eraser to wipe off the chalk markings from the board.
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