例句：
Study on the control system of intelligent blackboard eraser
智能黑板擦控制系统研究
Life is the art of drawing without an eraser.
生活是一门没有橡皮擦的绘画艺术。
Oh, yes. I want a new eraser.
噢，是的。我想要一个新橡皮。
Do they pass the eraser from one to another?
他们是把橡皮从一个人传给另一个人吗？
I have one ruler and he has one eraser.
我有一把尺，他有一块橡皮。