Scratch paper, scratch books, pens, pencils, and even brushes can be found everywhere on the floor.

Stacks of books were messily placed on various tables and chairs, some of them were two, some were three, or even several people were in a small circle, discussing something fiercely.

As soon as the elevator door opened, I saw a long piece of rice paper on the ground, and two people, one lying on it, writing with a brush, and the other standing aside, nodding and watching.

Zhang Jianguo and Cai Zhou walked out of the elevator, and the two people opposite seemed to find it and looked up.

"Hello Headmaster. ”

"Hello Headmaster. ”

Then continue to bow your head and ignore them again.

Zhang Jianguo:

“。。。。。。。 ”

Cai Zhou's eyes continued to shine:

"What a library, this is heaven!!"

Zhang Jianguo is going crazy, heaven? Heaven is a fart! How did this library become like this? I don't know, I thought I came to the vegetable market!

What about the security guards, what about the administrators, and all the?

Originally, a while ago, he had been receiving a group of Peking University students complaining about it, which made Zhang Jianguo already have a splitting headache, and when he was about to call Su Yun over and say hello to him, suddenly no one sent a complaint letter.

He breathed a sigh of relief at the time, thinking that the security guards and staff of the library had reminded Su Yun, so he was at ease, and he was not ready to look for him again.

As for those who said in the complaint letter, they demanded that the student be severely punished.

Zhang Jianguo can only hehe, if he changes someone, he will be punished.

But Su Yun, a nail, is destined to be a genius who can enter the Chinese Academy of Sciences in the future, and if he goes out, it can be regarded as the signboard of their Peking University, can he dispose of him casually?

As a result, it's better now, I didn't listen to Su Yun's trouble, you guys jumped out of a whole floor of Su Yun this time?

At this moment, the elevator next to it also opened, and a female librarian walked out of it.

The female librarian looked to the right, saw Zhang Jianguo, and nodded with a smile.

Then turn your head ... Shouted loudly:

"Where is the Art of UNIX Programming, send it to me, I'm going to record it first!"

Zhang Jianguo:

“！@￥…… &”

Cai Zhou's eyes continued to shine.

After a while, a student ran over with a book in his hand.

"Hehe, Sister Administrator, I'm sorry, I forgot the time, the book is here. ”

"Well, just remember that next time. ”

"Hehe, I'll remember it next time!"

After saying that, the female administrator turned around and went downstairs.

The student who returned the book casually looked to the left, saw Zhang Jianguo, smiled and said, 'Hello principal', and then ran back again.

Zhang Jianguo:

“。。。。。。。。 ”

Cai Zhou's eyes continued to glow.

Zhang Jianguo's head was a little dizzy, he took his mobile phone, and quickly found the administrator's phone and called.

As soon as the phone was connected, Zhang Jianguo asked in a deep voice:

"What are you doing?!Do you want to do it?"

The chief administrator was a little confused:

"School.. Headmaster, what's the matter?"

Zhang Jianguo's face was gloomy:

"What's the matter, what's going on on the sixth floor?"

"Sixth floor? Nothing should have happened on the sixth floor? I only went around ten minutes ago. ”

"Nothing's wrong? What has become of the sixth floor? Huh? Which library have you ever seen like this?"

"This.... Isn't that what you acquiesced to, Headmaster?"

When Zhang Jianguo heard this, he exploded:

"Nonsense! When did I ever acquiesce to such a thing?"

"Just before. . . A few days ago, Principal, didn't the student you arranged in A301 be jointly complained by hundreds of students? Actually, we also want to take care of this matter first, after all, it was the student you personally arranged to come in. But the students' complaint letters have been sent, and we have to wait for you to deal with the matter. ”

"Then everyone thought he was going to be punished, but didn't you say anything in the past few days....., headmaster?

Zhang Jianguo was silent, with indescribable fatigue in his heart.

"So, you didn't care about yelling in the library after that?"

The other side immediately replied:

"That's not it! This is only on the sixth floor, and the other floors are still the same as before!"

"Okay, I got it. ”

After speaking, Zhang Jianguo hung up the phone and looked around helplessly.

Cai Zhou looked at Zhang Jianguo, smiled, looked at the entire floor in front of him, and the students who were discussing fiercely said:

"Guo smash, take a closer look here, isn't this also good? Whoever stipulates that in the library, you can't discuss it loudly? Who rules that in the library, you don't talk loudly? I think this place is more like a library now!"

After a pause, Cai Zhou looked at the front of him with longing, and said softly:

"If only I had a library like this when I was in school. ”

Zhang Jianguo was stunned when he heard this, and looked at the scene around him again.

"I said, you're wrong!"

"Fart you! take a good look, what's wrong with me?"

"It's all said, you can't jump directly to this step here, and the formula in your middle can't prove it. ”

“......”

"Eh, Brother Guozi, this question is a bit difficult, come and help me take a look. ”

"What's the question, I'll take a look. Oh, I saw this question yesterday, and I thought about it for a long time, but I didn't come up with it. ”

"Brother Guozi, what method do you use? It's also a matrix?"

"Matrix? I didn't use a matrix, I used permutations and combinations. ”

"Permutations? I have an idea!"

“......”

"Guan Guan Ju Dove, in the River Island, My Fair Lady, Gentleman is good! Good words, Brother Ren!"

"Hehe, Brother Lu praised it! My level is still not as good as Brother Lu!"

"Eh, don't say that, Brother Ren's handwriting, I'm afraid that it has already far surpassed me, how dare I compete with Brother Ren. ”

"Brother Lu's handwriting, when he was on the competition field, he envied me, and it is not an exaggeration to say that he is my idol!"

“......”

Looking at everything in front of him, Zhang Jianguo suddenly felt as if... Is that really good?

"Hey!"

Sighing, Zhang Jianguo walked towards the two students who were blowing each other in business.

"Excuse me, classmate, is the student who was the first student here now?"

When the two heard this, they stopped blowing each other, and the person who was called Brother Lu said:

"Is the principal looking for Brother Su? Brother Su is in Section D now. ”

Brother Su?Zhang Jianguo twitched the corners of his mouth, nodded, and walked towards Area D with Cai Zhou.

Along the way, the library that was originally clean and tidy is now full of books, waste paper and notebooks, and when people passing by see him, they all say 'hello principal', and then they discuss their own things, and they are not affected in the slightest.

"It doesn't feel bad. ”

Zhang Jianguo pondered as he walked, not knowing what he was thinking.

........

When the two of them came to Area D, they easily found Su Yun.

Because there was a circle around Su Yun, a vacuum area was reserved, and Su Yun was discussing loudly with a little girl.

It was only now that he finally knew why there was only one person complaining on the complaint letter.

Obviously, the other person who was discussing with Su Yun was Meng Meng!

And who is Mengmeng? That's an associate professor at Peking University! A 14-year-old genius girl, an associate professor hired by Peking University for the first time! Is there anyone at Peking University who doesn't know her?

Since they know each other, who would have nothing to eat and support and dare to complain about the associate professor of Peking University?

The two walked in, and when they heard the topic they discussed, Zhang Jianguo and Cai Zhou were stunned at the same time.

"When a fluid flows around the flow at a large Reynolds number, the viscous force is much smaller than the inertial force at a distance from the solid wall and can be ignored, but the boundary layer cannot. ”

"Is it because there is a large velocity gradient along the normal direction of the wall?"

"That's right, the larger the Reynolds number of a fluid, the thinner the boundary layer. The transition from the flow inside the boundary layer to the flow outside is gradual, so the thickness of the boundary layer is generally defined as the vertical distance from the object surface to the external flow velocity equal to about 99%....."

"Oh~ It sounds a little complicated, it turns out that it is so difficult to build an airplane!"

"Well, in fact, in physics, as long as you master aerodynamics, fluid mechanics, theoretical mechanics, structural mechanics, elastic mechanics, thermal engineering, materials science, electrical engineering, computer communication science, microelectronics, applied mathematics, high-energy physics, welding engineering, operations research, machining, management theory, process theory, it is almost the same, it is not too difficult. ”

Zhang Jianguo:

“。。。。。。。。 ”

Cai Zhou:

“。。。。。。。 ”

Cai Zhou's head couldn't turn around, he looked at Su Yun, then at the little girl, pointed at Su Yun, and asked Zhang Jianguo, who was stunned on the side:

"This is Su Yunli?"

Zhang Jianguo nodded his head.

Cai Zhou asked again:

"Isn't he a math expert?

Zhang Jian's Chinese language was blocked for a long time, and he held out a sentence:

"Probably...... Mathematics and physics are not separated??"