1. blackboard eraser
   黑板擦
   

1. Scraped my fingernails down the BlackBoard.
   用我的指甲在黑板上刮擦
2. The blackboard was screwed down to the wall.
   黑板是用螺丝拧在墙上的。
3. Come to the blackboard.
   请到黑板前面来。
4. Point to the blackboard.
   指着黑板。
5. I hate the scrape of chalk on a blackboard.
   我讨厌粉笔在黑板上刮的声音。

　1个名词解释