The book-crossing case happened! The villains all want me to go to jail

On the university campus, time is like a gurgling stream, moving forward quietly but firmly, carrying the dreams and expectations of youth every moment.

After a long and tortuous separation, Xie Xuan'an finally stepped into this familiar yet slightly strange palace of knowledge again.

It was an early morning when the morning light shone through the mottled leaves. Xie Xuan'an came to the classroom early with some trepidation and anticipation.

He found a seat by the window, took the books out of his backpack gently, and placed them neatly on the desk as if they were treasures.

At this time, he had an eager desire for knowledge, but also a little uneasiness about being away from campus life for a long time.

At this moment, Su Yi, full of energy and vigor, entered the classroom as quickly as the wind.

His eyes instantly caught sight of Xie Xuan'an, and a smile as bright as the warm spring sun immediately broke out on his face. He strode towards Xie Xuan'an without hesitation.

"Xuan'an, you're finally back!" Su Yi's voice was full of joy and excitement. He sat down next to Xie Xuan'an and patted his shoulder excitedly.

The bell rang and the professor began to teach. Xie Xuan listened attentively, but due to his absence for a while, some of the knowledge points seemed difficult and unfamiliar to him.

His brows were slightly furrowed, and his eyes revealed the confusion of trying hard but still failing to figure out the answer.

Su Yi, who had been silently paying attention to him, keenly noticed this, and quietly leaned close to Xie Xuan'an's ear and whispered, "I understand this part, I will tell you after class."

The bell for the end of get out of class rang melodiously. Su Yi did not hesitate at all. He quickly took Xie Xuan'an's hand and walked to a quiet corner.

He picked up a pen and carefully drew pictures on paper, while explaining complex concepts in detail using clear and organized language, patiently and meticulously.

Su Yi was drawing a picture on paper and said, "Xuan, look at this function f(x) = x^3 + 2x^2 - 5x + 1. We need to find its definite integral on the interval [0, 2]. First, we need to find its original function F(x).

通过积分运算，原函数 F(x) = (1/4)x^4 + (2/3)x^3 - (5/2)x^2 + x 。

Then, according to the definition of the definite integral, the value of the definite integral is equal to the difference between the values ​​of the original function at the endpoints of the interval, that is, F(2) - F(0).

算出来 F(2) = 26 / 3 ，F(0) = 0 ，所以这个定积分的值就是 26 / 3 。

Do you understand it? "

Xie Xuan'an's face showed a look of sudden enlightenment.

At noon, in the busy cafeteria, Su Yi's eyes searched the crowd eagerly. When he saw Xie Xuan'an, he walked over quickly and insisted on sitting with him. He enthusiastically picked up food for Xie Xuan'an.

He kept saying, "Eat more. You've lost weight recently." His words were full of concern.

In the afternoon group discussion class, Su Yi actively pulled Xie Xuan into his group.

During the discussion, when Xie Xuan'an couldn't keep up with the pace, Su Yi would always give him a hint in a clever and timely manner, either with a look or a short word.

Help Xie Xuan to smoothly integrate into the discussion without letting him feel awkward or helpless.

As night fell, the lights in the library seemed particularly peaceful and warm. Su Yi had already reserved a seat for the two of them and was quietly waiting for Xie Xuan'an to arrive.

When Xie Xuanan walked into the library, Su Yi smiled with relief. They sat down side by side and began to review the day's lessons.

Su Yi observed Xie Xuan'an's expression from time to time. As long as he found that he was a little confused, he would immediately stop writing and explain it again patiently until Xie Xuan'an fully understood it.

A few days later, the school held a lively basketball game. Su Yi signed up without hesitation and strongly asked Xie Xuan'an to come to the scene to cheer for him.

During the game, Su Yi was agile and every time he scored a goal, he would excitedly shout in the direction of Xie Xuan'an, as if Xie Xuan'an's presence gave him endless strength.

After the game, Su Yi ran to Xie Xuan'an with sweat all over his face, put a hand on his shoulder, and said with a heavy breath: "With you cheering beside me, I feel like a superstar!"

In the laboratory, Xie Xuan'an faced the experimental difficulties alone. He tried again and again but could not get the correct result. He was filled with anxiety and frustration.

After Su Yi learned about it, she gave up her precious rest time without hesitation and rushed to the laboratory to accompany him. They worked together at the laboratory table, consulted a lot of information, constantly adjusted the experimental parameters, and experienced countless failures, but never gave up.

Finally, with the joint efforts of the two, the problem was solved. At that moment, their faces were filled with the joy of success.

On the weekend, the sun was shining brightly, and the classmates made an appointment to go hiking. Su Yi followed Xie Xuan'an closely along the way, like a caring guardian.

He vividly told Xie Xuan'an all the interesting things and gossip that had happened in the school during this period. Those vivid descriptions and exaggerated expressions made Xie Xuan'an laugh from time to time, making the entire mountain climbing journey full of joy.

During a tense classroom test, Xie Xuan'an answered the questions slowly because of nervousness.

After finishing his own questions, Su Yi took advantage of the teacher's inattention and carefully and secretly handed Xie Xuan'an a small note with key hints on it, which helped Xie Xuan'an complete the test smoothly.

The school's cultural festival is coming, and the campus is full of joy and vitality. Su Yi enthusiastically took Xie Xuan'an to the activity venues of various clubs and participated in various interesting games and competitions together.

They racked their brains in front of the riddle-guessing booths, competed with each other in calligraphy competitions, cheered and applauded under the stage of cultural performances, and spent one unforgettable moment after another together.

As the days passed, with Su Yi's meticulous companionship and help, Xie Xuan'an gradually adapted to the campus life after returning and gradually caught up with the progress of his studies. They were almost inseparable, and Su Yi's dependence on Xie Xuan'an became more and more obvious.

One day, on the campus path, Xie Xuanan finally couldn't help asking Su Yi: "Why are you always around me lately?"

Su Yi was slightly stunned, then showed an honest smile.

Said: "During the time you were away, I always felt empty inside, as if something important was missing. Now that you are back, of course I must cherish every moment with you and stay with you more."

In this way, during their college years, the friendship between Xie Xuan'an and Su Yi became deeper and firmer.

They supported each other, grew together, and became the most precious and indispensable part of each other's college life. Their story has also become an enviable legend on campus, inspiring more students to cherish the friendship around them and go through the wonderful college life hand in hand.