blackboard

黑板英释nna board with a dark smooth surface, used in schools for writing on with chalk

1 blackboard eraser,n. 黑板擦

1 He chalked out a design on the blackboard..他用粉笔在黑板上勾划出一个图样。

2 She rubbed the exercises off the blackboard after class..下课后她把习题从黑板上擦掉。

3 The teacher knocked on the blackboard to catch our attention..老师敲了敲黑板以引起我们的注意。