Probably 15 seconds ago.

First of all, Zhang Yuechen's pen is specially made by himself, and there is a button on the barrel that can control the expansion and contraction of the nib.

The thumb was quietly snapped, and the tip of the pen was quietly retracted in the process of his writing.

Then you can see that he is holding this hollow pen with no nib and only a pen case, and writes with relish on the test paper!

It turned out that a special "invisible paper" had been quietly stuffed under his test paper, and if he was pasted on the table, it would be integrated with the table, and if it was pasted on the test paper, it would be integrated with the test paper.

This technology is derived from trick-or-treating, and he proudly named it: "trick-or-treating-style cheat note".

Then, another key point is that the small note is soaked in a special potion.

By pressing, the handwriting is printed on the soaked surface of the paper.

And it must be adjusted through a light amount of carbon dioxide to achieve the purpose of making the word visible.

The whole potion contains vitamin C, rock sugar and other ingredients, which are absolutely beneficial to the body, so the pieces of paper that he brewed can be chewed and eaten directly as chewing gum!

This potion comes from the little naughty little and is proudly named by her: "Invisible Water for Naughty Cheats".

Combining the two artifacts, Zhang Yuechen successfully quietly put this bland little note into his sleeve.

Then seize that distracting moment and find an opportunity to focus the attention of all four proctors!

Attention, it's time to start playback!

In the first second, Zhang Yuechen accidentally knocked off the answer sheet because of "hard writing". At the same time, during the internal test of Xu Yihan's watch behind him, a metal patch vibrate.

In the second second, the right hand that had already hidden the paper ball, quickly put down the pen and fished it towards the falling answer sheet, Xu Yihan made a preparation posture without knowing how to do it.

In the third second, with a flick of his hand, he threw the paper ball into the palm of his hand, and at this moment, the sound of ah attracted the attention of all the invigilators.

In the fourth second, the back of the arm is facing forward, the palm is facing back, perpendicular to the ground, aiming behind you, the hand is in the shape of a half-clenched fist, lean down, and aim!

The middle finger is fiercely against the palm belly and flicks it! At this time, the invigilator's eyes just fell on him.

Therefore, I didn't notice that a tiny ball of paper was scratching fifteen meters against the ground!

They were staring at the action that Zhang Yuechen picked up, trying to find out if they had picked up other things from the ground by the way.

In the fifth second, the paper ball bounced directly on Xu Yihan's shoes, and then was bounced up by the rotating torque, taking advantage of the invigilator's attention on Zhang Yuechen.

Xu Yihan had already placed his position, stretched out his palm facing down on the table, and grabbed the small paper ball that bounced up.

And the invigilator did Zhang Yuechen just picked up the answer sheet, and after not attaching any extra things, he also retracted his gaze and began to inspect the others......

In just five seconds, the whole set of actions was completed smoothly, and I didn't feel that this was the first time Zhang Yuechen had done this!

This is also related to Zhang Yuechen's serious attitude, he didn't sleep all night and rehearsed all possible scenarios in his mind.

And use the brain early to simulate various countermeasures, the angle of force, the size of force, the timing of force, and so on......

There was even a diamond marksmanship first style in the action just now, and the technique of shaking the wrist in the thunderous throwing action, otherwise it would be impossible to achieve that kind of spinning force.

After taking a look at Wang's computer, Zhang Yuechen began to move again......

Holding a ball of paper in the palm of his hand, he pretended to look at the time and glanced at the watch, at which time the little trick-or-treater had calculated various angles and forces on the dial.

Zhang Yuechen's left arm was pressed against the table, his arm shrank back, and the cuff covered the small half of his palm.

At this time, the ring finger quietly reached into the sleeve, and quietly outlined a transparent and extremely thin elastic silk thread.

This transparent silk thread was specially made for Zhang Yuechen by Little Mischievous and Little Naughty, and the elasticity was just within the range of his fingers.

They named it: "Bowstring for mischievous cheating!" ”

Although these two light brains can come up with a more powerful plan, with the existing materials at home, it is already the limit to be able to do this step.

When Zhang Yuechen turned on the 3D printer, he was stunned for a moment.

Is there really something here? Why can't you see anything?

If it weren't for the naughty explanation in time, Zhang Yuechen would almost have to clean up the little mischief.

When he did find an invisible thread from inside, he really thought that the box was actually empty.

Silently, he circled his ring finger twice and pulled the silk thread out.

Rub your index finger, middle finger, and ring finger back and forth to complete the appearance you have imagined in your heart.

I saw that his index finger and ring finger were stretched out to the middle finger, and the middle finger was placed on the gap left by the two fingers.

It turned out that Zhang Yuechen actually used two fingertips as a fulcrum, withstood an invisible bowstring, and completed a finger crossbow!

At this time, the patch under Wang's computer watch vibrate, and he opened the pencil case knowingly.

The thumb holds the paper ball, the palm is bent, and the thumb uses the paper ball to hook the elastic wire and pull it back to accumulate force.

Zhang Yuechen aimed in the direction of Wang's computer, saw the opportunity, and suddenly let go of his thumb!

"Whoosh!"

Through the precise guidance of the middle finger track, the paper ball crossed a distance of seven or eight meters at a very fast speed, and accurately hit the pencil case of Wang Computer!

Wang Computer pretended to take out the paper ball when he took out the pen......