A large-capacity pen, Xu Xuanyue turned the ink in her hand and threw it to the tip of the pen, 20 minutes have passed, the English teacher sent the test paper in class, although she will be explained in the classroom later, but she still did not write a word, if the test paper is more difficult, then she should at least leave the name column empty.

Xu Xuanyue wanted to devote herself to learning as soon as possible, but her hand holding the pen always turned against her, and her eyes also wanted her to look out the window, as if there was some beautiful scenery outside, but Xu Xuanyue couldn't see anything except the gray and about to enter the dark sky.

Her mind was a mess, like a crowd of praying people reciting disturbing scriptures in her head, and like a group of passionate youths partying around a campfire. In short, thoughts that had nothing to do with studying were a mess in her head, which upset her and made her feel out of place in the quiet atmosphere of the classroom.

Turning his head to look at Ke Yuhan, he had already done the last question required by the teacher, this guy is all-round except for Chinese.

She gave up the idea of immediately adjusting her state, closed her eyes and probed the source of this irritability, and she remembered that she had taken a nap at noon, and she was more tired than usual; She remembered the lunch she had at noon today, with her favorite sweet and sour pork ribs; She remembered Zhou Junlan's face when she left at noon......

Ke Yuhan found that Xu Xuanyue's state in the afternoon was very wrong, and one of the very powerful evidences was that from the afternoon to the current evening self-study, she didn't even take out the mirror, and the first thought that popped into his mind was that she lost the mirror she gave her, and now she is sad and sad.

After he finished writing the last question of the test paper, he immediately twisted his wrist, and went out of the blackboard newspaper at noon, and in the afternoon he had a huge amount of calculations in the math class, and now he had to write the test paper, his wrists were sore, and his fingers were stiff.

Then he turned his head, wanting to continue to observe Xu Xuanyue.

She fell asleep directly on the table, it seemed that this test paper was not going to be done, he shook his head helplessly, but he had no idea of waking her up, Ke Yuhan turned sideways, supported his head with his left hand, and leaned on the table, making sure that Xu Xuanyue was blocked by half of his body as much as possible, and took out his math homework tonight......

Su Xin was pondering whether the object clause or the definite clause followed most of the time when a note was stuffed from the left.

She turned her head.

Xia Yuan clasped his hands, his face was pale, much worse than the usual blood on his face, because of this, his dark circles under his eyes were particularly prominent, Su Xin had watched the TV series, if he stuck out his tongue now, it would be like a life-threatening white impermanence.

"Yikes!"

When Su Xin saw him like this, she accidentally screamed and got the attention of everyone around her, she lowered her head shyly, and when her eyes were gone, she looked at Xia Yuan, lowered her voice and said, "Why do you have such a bad face?" ”

Xia Yuan didn't speak, he stretched out his trembling finger and pointed to the note, motioning for her to read.

The note read: We're still young, aren't we?

This sentence made Su Xin ask in a fog, and she didn't know where she came about, and she couldn't figure out how such a sentence came about, or what the point was, her brows furrowed, as if she had encountered a difficult problem that was even more difficult to answer than the question just now, and turned to look at Xia Yuan.

His purple lips trembled slightly, and he pouted, "I...... We're still young, aren't we? He leaned closer to Su Xin's ear: "There are some things, we, we are now, we are not, we can't do it right, right?" ”

Su Xinke was really frightened, thinking that he was so sick that he became unconscious, he reached out and touched his head, it was not hot, and it was still cold. She suddenly felt a little intimate in this action, and subconsciously looked at Xun Ran.

"Wow!!"

The English teacher who was preparing for the lesson on the podium looked up, her slightly moist red lips pursed, wanting to see who was disturbing her concentration for the second time.

Su Xin lowered his head in a hurry, dodging the teacher's gaze.

She controlled her emotions and looked at Xun Ran again to confirm, in order not to scream again, she covered her mouth.

Xun Ran's face was as pale as the paper that had just been washed, and even her lips had completely lost their ruddy luster, she was lying on the table, her arms were hanging down, her eyes were no longer luster, and she looked at this side, terrifyingly hideous.

The two of them, at noon today, heard what they shouldn't have heard, thought of what they shouldn't have thought, and ran away before investigating the situation clearly.

The two of them have grown a lot together.

But the innocent Su Xin was so frightened that he broke out in a cold sweat......

The dim light of the sky outside the window was gradually overshadowed by the shining street lamps, and the sky was reflected by the light of the city lights in a yellow halo, hanging in the sky, like a golden lamp.

Ke Yuhan bent down, stretched the broom under the last row of desks, swept out the drink bottle hidden in the corner, and then dialed it into the dustpan. This seat is the seat he has cleaned so far, and he curiously turned the pages of the book, and there was a name written crookedly on it: Hong Feng.

"You shouldn't be flipping through other people's books." Xu Xuanyue walked in through the back door, holding the trash can that had just been emptied.

Ke Yuhan heard the sound and put down the book: "You slept in self-study at night, what's wrong, didn't you sleep at noon?" ”

"It's okay." Xu Xuanyue casually threw down the empty bucket, still vibrating in the bucket with her voice, making a loud noise, as if she was venting her dissatisfaction.

"What's wrong? You don't look like you're happy. Ke Yuhan asked.

"Nope." Xu Xuanyue leaned on the desk and clasped her hands around her chest: "By the way, by the way, what are you doing at noon?" ”

She suddenly noticed that the blackboard in the back of the classroom had been drawn on the blackboard at some point.

"Wow-" Xu Xuanyue sighed in surprise.

Maybe she can't understand the dense mathematical formulas and strange mathematical patterns on the blackboard, but these strange patterns seem to have a special beauty, special charm, all kinds of geometric patterns are skewed at a certain angle, it seems strange and difficult to accept at a single glance, but on the whole, the layout is neat, it looks refreshing, like a piece of ugly puzzle perfectly embedded in a gap is comfortable.

Xu Xuanyue was fascinated by mathematics for the first time.

"Am I okay with my drawing?"

"Well, pretty...... Well? Xu Xuanyue came back to her senses: "You just said you painted?" ”

"Yes, the blackboard newspaper I published with Zhou Junlan at noon was the beauty of mathematics, so she asked me for help, and she was so tired that her hands were sore." Speaking of this, he felt his wrist ache again.

Xu Xuanyue's brain was as hearty as a blocked chimney open, and she smiled and said, "Awesome, awesome." "It's like a heavy stone hanging in my heart to the ground, although the shock makes my hands and feet numb, but the result I get is finally satisfactory.

After jumping out of the chaotic state, Xu Xuanyue saw the problem clearly, so much so that she felt ridiculous about her previous sullenness, squatted down and covered her mouth and laughed.

Do girls like to laugh out loud for no reason? Ke Yuhan thought of today's noon, and Zhou Junlan also laughed like this.

"There's an empty piece there? Is there anything else to draw? Xu Xuanyue pointed to an empty board left in the middle of the blackboard.

"Oh." Ke Yuhan smiled and supported himself with a broom: "I'm going to draw a function diagram." ”

"What function?"

“（x^2+y^2-1）^3=x^2y^3。”

Xu Xuanyue was confused: "A little dizzy...... What kind of pattern does that draw? ”

"Want to know?" Ke Yuhan smiled: "Go check it out." ”