教授正在上这学期最后一课，他讲了学生的作品作业，让他们准备好最后的让他们好好准备考试。他说：“现在试卷正在由印刷工印刷手里。大家还有什么问题吗？”

课堂上一片沉寂，突然有个声音从后排飘来，问道：“印刷工是谁呀？”

Who is the printer?

The professer was giving the last lecture of the item. He spoke about the students work,and tell them prepare the final exam well. He said, "Now the exam paper is handing by the printer. Have any question?"

There is silent.Suddenly a voice from the rear asked,"Who is the printer?"