黑板 blackboard

　　例句

　　If you write on the blackboard， rub it off at the end of the lesson.

　　如果你在黑板上写字，下课时要擦掉。

　　He wrote a few more notes on the board.

　　他在黑板上又写了几条注释。

　　The teacher wrote on the blackboard with a piece of chalk.

　　老师用粉笔在黑板上写字。