The girl sat there blankly, her breasts half wrapped, her temples slightly moist, her breath like orchids seemed to have a rich fragrance, and her jade-like skin was covered with a layer of snow-white luster.

Chen Ya stared at it blankly for a long time, his mind filled with messy things like "the thin strands of crimson silk, the thin ice and the glistening skin, the greasy, crispy fragrance of snow in one hand".

"Have you seen enough?" The girl's cold words brought Chen Ya back to reality in an instant.

"Ah, I'm sorry."

Chen Ya turned his back and asked with concern: "Who tied you here? Do you want to call the police? Where are your clothes?"

This sentence didn't elicit any response like a mud cow drowning in the sea. Chen Ya waited for a long time and turned around, only to see the girl's face was red and her fists were clenched, as if she was sulking.

"Turn around!"

Chen Ya turned his head hurriedly. After a while, the girl behind him seemed to calm down. He bowed.

"I am not tied here, I am here myself."

Chen Ya stared: "You said you tied yourself up?"

"No, I didn't tie myself up, I was..."

"Are you there?" Chen Ya asked tentatively.

"sleeping."

"..."

The two were silent for a while, then Chen Ya turned back gently and whispered: "Bow."

"If you are being coerced, just blink and I will find a way to rescue you from the hurricane."

"I don't have any!"

…

It took Chen Ya a while to figure out that this girl named Lu Aiai was actually just sleeping here.

"So you were sleeping. I thought you were kidnapped." Chen Ya said with a smile, "Then why didn't you remind me?"

At this time, Lu Aiai had already put on her clothes. She wore a simple white shirt underneath, black tight jeans on the lower body, and a white coat that she didn't know where she got it from.

However, her figure is very good. After wearing a loose white coat, she looks even more charming, giving her a slender and thin feeling.

"I, I...that kind of thing is over in the past, and I don't mind it anymore," Lu Aiai said indifferently, "So, which department are you a student in? How come I haven't seen you before?"

Chen Ya smiled and said vaguely: "I hang out in school every day, haven't you seen me, schoolgirl? Maybe you don't go out much."

"Senior sister..."

Hearing this title, Lu Aiai's face turned red again. Chen Ya found that this girl blushed easily.

Chen Ya didn't want to reveal that he was not actually a student of Peking University so quickly. With his status as a student, it was always easier to do things. If he told the other party that he was just a former librarian, he might not borrow it.

It was a good thing that Lu Aiai didn't know him - in Chen Ya's eyes, this Lu Aiai was probably a student who didn't like studying very much.

After all, everyone who has been to the library should know me. Bow

Lu Aiai looked at him suspiciously with her hands on her hips and said, "Then what are you here for?"

"Oh, I want to come and visit our school's tennis club," Chen Ya made a swing, "I want to come and practice tennis every night for a month from today."

When he said this, he tried to make his expression hard and serious, with a faint smile on the corner of his mouth - judging from experience, this expression is very lethal to girls.

However, Lu Aiai kept staring at him suspiciously, her expression not changing at all.

Chen Ya's scheming just now was like giving a wink to a blind man.

"You want to practice tennis, right? Okay, I'm in a good mood," Lu Aiai nodded, "However, classmate, your way of speaking needs to change. How do you think about it and how can it be convenient for others? In the future, you will enter the society.

If you use this way of speaking, you will hit a wall."

"……"bow

This girl obviously looks younger than me. She hasn't left college yet, but she speaks in an old-fashioned way.

Chen Ya felt that he had been scolded by her

What happened at the meeting seemed extremely funny.

"But that doesn't mean I won't agree. The tennis club is closed today and there will be no one at night. If you want to use the court, we can use it for you. If you want to come here in the future, it will have to be after 9 o'clock every day, because everyone is usually very active in training.

"

Chen Ya thanked him and asked, "Are you the president of the tennis club?"

"No...but you can agree to what I say as a tennis club." Lu Aiai turned her face away and combed her hair, "Lights out at 10 o'clock in the tennis court, please hurry up."

Because there was no one else, no one could practice with Chen Ya, so Chen Ya could only practice serving by himself.

She played for a while with a few balls in her hand, and had to pick them up from time to time, which was not very efficient. Lu Aiai kept crossing her arms and looked at him from the side of the court, yawning from time to time.

He wanted to ask Lu Aiai if the tennis club had a ball server, but seeing that Lu Aiai was very cold towards him, and there had been such embarrassing situations before, he felt a little embarrassed to ask her.

After playing a few balls like this, Lu Aiai suddenly spoke.

"Have you ever played tennis before?"

Chen Ya stopped his racket and said, "No, today is my first time playing tennis."

"Your serving action is pretty standard, but it's a bit awkward." Lu Aiai commented, "Actually, your action could be crisper, because you are a boy and have more strength, and your current action is a bit like a girl's."

"..."

The reason why Chen Ya's serving action looks like a girl's is of course because he has only seen Gu Yuqing play. Bow

"Let's be more sharp, do you want to swing the racket like this?" Chen Ya asked, "Exercise force like this, and then swing the racket?"

He demonstrated a few actions, and Lu Aiai frowned and said:

"From the perspective of fluid mechanics and anatomy, if you want to reach the highest initial speed in tennis, you need your brachioradialis, deltoid and pectoralis major muscles to exert force. Feel it for yourself. Are you exerting enough force?"

Chen Ya was a little stunned. If he didn't have some knowledge reserves, he wouldn't be able to understand what Lu Aiai was talking about.

He tentatively moved his right arm and felt the muscle groups that Lu Ai loved to talk about, and seemed to understand a little bit what she meant.

Although what Lu Aiai said was very useful, her way of expressing it made people a little uncomfortable.

Chen Ya also said in a professional tone: Bow

"I have seen a tennis player. When she serves, she also uses her wrist muscles, core muscles and lower limb muscles. Is it more efficient in that way?"

After Lu Aiai heard Chen Ya's words, she did not show any astonishment as Chen Ya thought.

Instead, she let out a long sigh and pressed the bridge of her nose and the center of her eyebrows, seeming helpless.

"Previously, I conducted an experiment on the muscle groups used in tennis's powerful serve. I told the subjects in advance the landing point range of the powerful serve, and used American wireless dely surface electromyography to collect the surface electromyography signal during the serve and synchronize it.

A high-speed camera records the action scenes and the landing point of the serve respectively, and measures the ball speed at the same time. Select the inner corner, middle road and outer corner with the highest ball speed, and the three ball speeds are consistent as the analysis action. The analysis stage is the batting stage, and the batting stage is from "
Chapter completed!