Yan Jiecheng thought for a while, and then remembered that there were four or five textbooks compiled at that time. This sentence was wrong.
I was going to write it in other textbooks. How can I write it here.
Yan Jiecheng looked at the student who asked the question and said, "The student looked at the textbook very carefully, and unexpectedly found a mistake in the textbook."
The student who asked the question immediately blushed and said: "No teacher is perfect. The greatest courage is to admit mistakes."
Yan Jiecheng saw this classmate called Zhen. He just said: "The students are embarrassed. Well, as the student said, this is really me..."