第 74 课: 数学运算-4

Someone is sharpening a pencil. 有人在削铅笔。

Someone is breaking a pencil. 有人把铅笔折断了。

Someone is writing with a pencil. 有人在用铅笔写字。

Someone is drawing with a pencil. 有人在用铅笔画画。

Someone is measuring with a ruler. 有人在用尺量。

Someone is drawing on the blackboard. 有人在黑板上画画。

Someone is drawing on a piece of paper. 有人在一张纸上画画。

Someone is using an eraser. 有人在用橡皮擦。