One day on the drawing class，the teacher told the class to draw an abstract drawing.

　　一天美术课上，老师要同学们画一幅抽象画。

　　After a while, a small boy turned his drawing in. The teacher looked at it but saw nothing，only a piece of white paper.

　　一会儿工夫，一个小男孩交了他的作品。老师看了看。可上面什么也没有，只不过是一张白纸。

　　“What did you draw”said the teacher.

　　“你画的是什么呀?”老师说。

　　“A cow eats grass.”the boy answered.

　　“牛吃草。”孩子答道。

　　“Where is the grass”

　　“草呢?”

　　“The cow has eaten it up.”replied the boy.

　　“牛把草吃光了。”孩子说。

　　“Well，but where is the cow”the teacher asked again.

　　“那么，牛到哪去了?”老师又问。

　　“It ate up the grass and then went away to drink water.”

　　“吃完草，牛便喝水去了。”