Another week later, the senior three teachers finally realized why the teacher who taught Yu Ning said, "every time Ning looks up, I''m afraid".


    Because


    "There is also a simpler check calculation. It is suggested to set the earth at the focus f (-, 0) in the rectangular coordinate system for help as shown in the figure below..."


    When Shi Ning spoke, the teacher knew, alas, they didn''t talk about the simplest and easy to understand method, so Shi Ning needed to supplement it.


    "Today, I was corrected by Shi Ning again. I have to think twice before preparing for class!"


    "Alas, Shi Ning''s knowledge covers a wide range of Zhenlu Zhian and Xi Qinghuan. I was enlightened and taught by her today."


    "I''ll tell you the truth. When Shi Ning lowers his head, I''m very happy. Once Shi Ning looks up, I know... Something''s wrong!"


    ……


    In the past two weeks, except that the Chinese teacher had no such experience and emotion, the three teachers of mathematics, physics and chemistry were trembling together. The English teacher didn''t want to talk. Did she know that her pronunciation was not up to the student''s standard?


    It used to be Lu Shian and Xi Qinghuan, but now it''s time to make a tiger out of three! She is still practicing her pronunciation every night after class.


    The Chinese teacher took a blank look at this. She wished Shi Ning could do the same, but she never did.


    Treat differently!


    "You''d rather have a chat when you don''t find it, so that I, a Chinese teacher, can feel your experiences? I''d like to have it." the Chinese teacher looked at him and said in his mouth that he was afraid. In fact, the happy colleagues are really annoying.


    Teacher Liu, the head teacher, immediately intervened and comforted the Chinese teacher, "Shi Ning''s Chinese is really weak, but she has been working hard. I heard that she went to miss Kang''s dormitory again last night? Alas, is it troublesome for you again?"


    Thinking that she came to ask for advice at more than 11 o''clock last night, Mr. Kang, who teaches Chinese, smiled. He leaned lazily against the office chair and said with a smile: "no way, Mr. Liu, you also said that her Chinese is a little weak. She also has a strong sense of crisis. The first monthly exam of this semester is coming. If she doesn''t refuel well, she will be the first in grade. I''m afraid it''s a little difficult."


    "It''s also very expected. Lu Zhian, the first grade in the previous year, is a permanent resident. Occasionally, Xi Qinghuan turns over. The first and second examinations are contracted by them every year and month. I''m really looking forward to joining this time."


    The duel between the strong and the strong has always been exciting, and the teachers began to look forward to it early.


    Speaking of the monthly exam, the teachers in the office talked more and had a good time.


    The physics teacher stood on the podium, looking at Shi Ning, Lu Zhian and Xi Qinghuan. His eyes were dazzled.


    The three students had a good argument. This time, Xi Qinghuan and Lu Zhian were peaceful against wartime. A few days ago, Shi Ning and Xi Qinghuan were peaceful against Lu Zhian. In short, in half a month, such a situation will happen once in three days and two days.


    As long as there is a dispute, the three will seriously ask each other for advice.


    Before, the teacher was worried that it would delay the review of other students. It was suggested that the three should not discuss in private after class. All the students in the class objected because they wanted to listen!


    Just like now, the three stood up and had a small five minute discussion.