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一年轻人进了大学。数学课上, 教授要他画个圆。他走向黑板,拿起粉笔,随手便在黑板上画好一个非常规范的圆。
A young man went to college. In math class, the professor asked him to draw a circle. He walks toward the blackboard, picks up the chalk, and draws a very regular circle on the blackboard.