To know that we know what we know and that we do not know what we do not know，that is true knowledge.
The Cheater
Donald was not very good at mathmath n.数学.
He could not understand the teachers explanations. Even when the teacher explained something a second time， Donald still could not understand it.
“Never mind，” Donald told himself. “Im quite good at other subjects. Ill cheat in the math exam， then I wont be in trouble.”
真知就是知道自己懂什么和不懂什么。
作弊者
多纳尔德数学不太好。
他听不懂老师的讲解。即使解释第二遍，他也听不懂。
“不要紧，”多纳尔德安慰自己，“我别的科目很好。我要在数学考试中作弊，那么我就不会有麻烦了。”
“Ill sit next to the boy whos best at math，” he thought， and copy down his answers.
The day of the exam came， and Donald sat next to Brian Smith， who always was at the top of the class in math.
Donald carefully copied Brians answers on to his own exam paper.
At the end of the exam， the teacher collected the papers and gradedgrade vt.评分， 评级 them.
Then she said， “Well， boys and girls， Ive decided to give a prizeprize n.奖赏， 奖金， 奖品， 捕获， 捕获物， 战利品 to the student who got the highest grade. Its difficult for me to decide who to give the prize to， however， because two students， Donald and Brian， got the same grade.
“Let them share it，” one of the other students said.
“Ive thought about that，” the teacher said， “but Ive decided to give the prize to Brian.”
“我将坐在数学最好的同学旁边，”他想，“并抄下他的答案。”
考试那一天到来了，多纳尔德坐在布思·史密斯的旁边。
布恩是班里数学学得最好的学生。
多纳尔德仔细地把布恩的答案抄下来。
考试结束后，老师把卷子收上去，开始判分。
判完后，她说：“好，同学们，我已决定给得最高分的同学奖励。然而我不知该奖励哪一个，因为两个学生，多纳尔德和布恩，都得了一样的分数。”
“让他们两个都得奖励吧，”一个学生说。
“我想过这样办，”老师说，“但我打算奖励布恩。”
Donald was angry when he heard this.
He stood up and said， “Thats not fair. I got the same grade as Brian. ”
“Thats true，” the teacher said. “However， Brians answer to Question 18 was ‘I dont know’. Yours was ‘Neither do I’.”
多纳尔德听到这话非常生气。
他站起来说：“这不公平。我和他得的分数是一样的。”
“是这样的，”老师说，“然而，布恩的第18题的答案是‘我不知道’。你的是‘我也不知道’。”