有这样一个例子：一个圆圈，当你画在一年级的黑板上时，学生的回答可能是皮球、太阳、苹果、烧饼、铁环……各种各样的答案。当你画在中学生的黑板上时，学生的回答可能是圆。而当你画在大学生的黑板上时，学生可能会哄堂大笑或拒绝回答，因为他们觉得这个问题太简单，不就是 There is an example: a circle, when you draw on the first grade blackboard, the student's answer may be the ball, the sun, the apple, the sesame seed, the iron ring ... various answers. When you draw on a high school student's blackboard, the student's answer may be round. And when you paint on a college student blackboard, students may laugh or refuse to answer because they think the question is too simple, not