Sweat slipped down Zhang Chengyuan's face drop by drop, his teeth were clenched, and his face was already red. Pressing the ligaments was a challenge for him.

Being physically strong does not mean that the flexibility is excellent, and Zhang Chengyuan's flexible teachers and classmates dare not compliment. Although Zhang Chengyuan's fighting skills are good compared to other classmates on weekdays, but now that he has joined the Sprout Project, of course, he can't be required by general standards, so many things have to be learned from scratch, such as the fighting style in free fighting.

Although Zhang Chengyuan learned all the four punches, six legs, three elbows, eight wrestlings and locks of kickboxing fighters when he was in middle school, he could even be more than the most professional kickboxers. Take the leg split as an example, the essentials of the action are knee bending, knee raising, leg lifting, and downward splitting, and the target is the opponent's head and shoulders. However, the key to splitting the leg is the height of the leg, and this height is determined by the flexibility of the body.

Zhang Chengyuan's ligament toughness determines the height of his leg lift, according to his current flexibility, his leg split leg can only reach the shoulder of a person who is the same height as himself, and there is not enough height difference, and the leg split is not a threat at all.

Zhang Chengyuan let go of Chen Jiatong last time, and he had already carried a warning on his body, so he worked harder and worked overtime to train. On the precipice of being expelled from school, he was given the opportunity to join the Sprout Project, and now he will work hard to protect this opportunity.

"Knock knock!" There was a sharp knock on the door.

Zhang Chengyuan retracted his straightened legs, panted vigorously and said, "Here!" ”

When I opened the door, I saw Liu Cambridge standing outside the door with a frown.

"What's wrong?" Zhang Chengyuan gasped and asked.

"What are you doing in the house?"

"Leg press."

"I'll go, you're not too tired, you're still pressing your legs so late."

"What's the matter with me?"

Liu Cambridge hesitated slightly, and said to Zhang Chengyuan seriously, "I saw Zhang Luoqi just now, she seems to be sleepwalking again." ”

"She sleepwalked...... It's not once or twice. Zhang Chengyuan also hesitated in his heart, he hadn't told other partners about Zhang Luoqi's ghost drawing talismans in his room last time.

"She just walked to the door of your room, stretched out her hand as if she was going to knock on the door, her hand stopped on the door for a long time, and then turned away, and I was a little panicked. Let me remind you that if there is a knock at the door in the evening, you should not hear it. ”

Zhang Chengyuan listened, and felt goosebumps all over his body, but he still said calmly: "Thank you, I know, it's not early, you can go to bed early." ”

Cambridge waved his hand and turned back to his room.

Zhang Chengyuan looked at the time, it was already half past ten in the evening, thinking back to Liu Cambridge's words just now, he couldn't help but shiver again, and decided to go to the bathroom to drain the water, and then go to bed early.

When Zhang Chengyuan walked to the bathroom, he passed by Zhang Luoqi's room, and paid special attention to it, there was no movement in the room, and he felt a little relieved. But when Zhang Chengyuan walked to the bathroom, he was taken aback.

The bathroom has a men's toilet on the left and a women's toilet on the right, and in the middle is a row of hand basins with a mirror on the hand basin.

And Zhang Luoqi was actually wearing a white pajama and standing on the basin. She stared at herself in the mirror.

Zhang Chengyuan stood on the spot in fright, only to feel that his rapid breath was inhaled and spit out from his mouth and nose.

Zhang Luoqi didn't seem to notice Zhang Chengyuan, who was scared stupid behind her, she slowly stretched out the tips of her fingers and gently pointed on the mirror. Her movements are gentle and ethereal.

The picture seemed to freeze for a few seconds, and then Zhang Luoqi retracted her fingers, turned around slightly, plopped, jumped off the basin, and then slowly walked out of the bathroom.

When she passed by Zhang Chengyuan, she slowly turned her head and glanced at Zhang Chengyuan. He didn't say anything, then turned around and walked back to his room.

Zhang Chengyuan's body stood stiffly, and the hot sweat he had just pressed his legs had become cold. Maintaining the standing position he had just turned into the bathroom, he watched Zhang Luoqi walk back to her own room with his spare eyes, and then dared to let out a long sigh.

is different from the haunted house experience in childhood, Zhang Luoqi is more like a real ghost.

Zhang Chengyuan silently took two steps back, then walked briskly, and then ran back to his bedroom.

Lock the door and go to bed.

The action is done in one go.

Zhang Chengyuan, who was sitting in the quilt, couldn't stop his thoughts, and his mind kept coming up with Zhang Luoqi's actions, from the day when he was ghost-drawing talismans in his room, to pointing at the mirror with the tip of his finger today.

Point your fingers in the mirror!

A flash of lightning flashed in Zhang Chengyuan's mind.

He remembered that during his lunch break two days ago, his friends were entertaining in the library, and Zhang Luoqi sat opposite him reading a book. Zhang Luoqi went to the bathroom halfway, put the book on the edge of the table, and before Zhang Luoqi took a few steps, the book fell off the table. Zhang Chengyuan was fascinated by the contents of the book at that time.

"Cheng Yuan!" Zhang Luoqi was about to walk out of the door of the library, and when she heard her book dropped, she turned her head and shouted.

Zhang Chengyuan seemed to jump back to the real world from the book, followed the sound to look at Zhang Luoqi, and then followed her eyes to look at the book that fell on the ground.

"Help me pick it up, thank you!" After Zhang Luoqi finished speaking, she walked out of the library and went to the toilet.

Zhang Chengyuan put down the magazine in his hand and bent down to pick up the book Zhang Luoqi was reading. I was going to pick up the book and throw it on the other side, but I accidentally found that the cover painting of this book seemed to be of the same type as the book Zhang Luoqi read a while ago.

Zhang Luoqi used to only read those lyrical essays or something, but now she is actually reading "Basic Optical Applications".

Curiosity rose, and following the card bookmark that Zhang Luoqi held in the book, Zhang Chengyuan turned to the page she was looking at just now - one-way mirror and two-way mirror.

Zhang Chengyuan simply popularized science: a one-way mirror is a mirror in the traditional sense, and a two-way mirror is also known as single-sided perspective glass, which is made of a film of metal chromium, aluminum or iridium added to ordinary glass by vacuum coating. This glass reflects most of the light back from the projection, like a mirror, but from the other side, it is just a side of glass. The methods for judging whether a mirror is a double-sided mirror include fingertip judgment, illumination judgment and anti-light transmission judgment method......

Zhang Chengyuan was lying on the bed, thinking about this incident and thinking about Zhang Luoqi's actions just now, and felt more and more strange.

The brain is still in a state of indecision, and the legs have already stepped out, get out of bed, and go out.

After a while, Zhang Chengyuan had already walked to the mirror in the bathroom under the drive of his subconscious.

Zhang Chengyuan stretched out his fingertips and touched the mirror.

The fingertips in the mirror were pressed tightly together with your own.

Zhang Chengyuan's mind was a little messy, he took a deep breath and adjusted his thinking. 1. According to the method in the book "Basic Application of Optics", the mirror in front of him is really a double-way mirror.

2. But why did Zhang Luoqi happen to watch "Basic Applications of Optics" two days ago?

3. Zhang Luoqi's behavior just now clearly shows that she is in a state of sleepwalking. If a person is sleepwalking, will he still remember what he saw in the book during the two days and come back to check if a mirror is a two-way mirror? What's more, how could it be so coincidental that Zhang Luoqi was in a state of sleepwalking and tested in front of him.

4. Why install a two-way mirror in this bathroom!

Zhang Chengyuan's brain at the moment is like an old-fashioned computer, using a stack processing method. When the fourth question came to mind, the first three were all pressed to the back.

Why, why is there a two-way mirror here, behind the mirror, is there something?

Curiosity drove Zhang Chengyuan to reach out to the mirror again.

Press the mirror a little harder, but the mirror doesn't move.

Push the mirror up hard, but the mirror doesn't move.

Push the mirror firmly to the left.

The mirror moved.