黑板的用法和样例：
例句
-
谁把我写在黑板上的数字擦掉了？
Who's rubbed my figures off the blackboard? -
黑板在教室的前面。
The blackboard is in the front of the classroom. -
老师在黑板上写出新单词。
The teacher wrote down the new words on the blackboard. -
请抬起头来，看黑板。
Please raise your head and look at the blackboard. -
老师用一支粉笔在黑板上写字。
The teacher wrote on the blackboard with a piece of chalk.
