Although Dong Han has studied a lot of biological evolution research, he has always been an animal, such as kittens, dogs, birds, and fish.

The battle was on the verge of breaking out at this moment, and the air seemed to be condensed. Dong Han's dry lips trembled, his throat gurgled and swallowed a mouthful of saliva, his eyes staring intently at "himself" in front of him.

It was too late, then too fast, and the robot soldier pulled the lower trigger at the same time. The sound of gunfire spread throughout the field, and the bullets ruthlessly destroyed many of the surrounding freezers. But in the blink of an eye, the clone Dong Han was standing in place, waving the steel blade in his hand at a very fast speed, and all the bullets were blocked by him.

What kind of operation is this? Dong Han thought to himself, and at the same time secretly applauded, after all, no matter how you look at it, they are both grasshoppers on the same boat.

Seeing that the bullet attack was ineffective, the robot soldier was not too surprised, but just flicked a certain button to the side of the gun in his hand, and immediately a blue light appeared. Unleash a powerful cannon that will surprise the heavens!

Seeing that the clone was about to dodge, Dong Han also secretly said something bad in his heart. At the end of the clone's right elbow, the white bone elongated and thickened a lot, quickly forming a cavity. At the same time, the steel blade of the arm swung forward vigorously. Boom———— huge amount of air was expelled from the cavity in the tail, and the steel blade flew out with it, driving a huge strong wind. Between the lightning and flint, the steel blade slashed towards the blue electric cannon at a rapid speed, and exploded ten meters before rushing towards the clone!

However, the steel blade still had no intention of stopping, and rushed towards a group of machine soldiers. Another crack of metal knocked out the three robot soldiers. Sparks kept coming out of the robot soldier's body, and his limbs wanted to move, but the chip in his brain had been burned out, and Xu was paralyzed.

The clone had a solemn expression, his legs leaping into the sky, and the steel blade that flew away circled around as if magnetically, merging into one on his arm. And the tail of the clone Dong Han also instantly formed a cavity, gathering a huge amount of air inside. The tail gas compressed, condensed at a point, and burst out instantly. The jet of gas, coupled with the speed of it, actually left an afterimage in the air!

With a sound that was louder than just now, like an earth-shattering thunderbolt. Dong Han, a clone who was originally jumping in the air, teleported to the middle of the robot soldiers in the next second, and could feel a huge crater smashed into the ground. And apparently, this force has broken through the sound barrier. Dong Han's ears also heard a sound that seemed to be similar to a sonic boom.

The propagation of sound in the air is like the water waves produced by throwing stones into water, and it travels outward through the form of waves, which is called sound waves. The sound we usually hear is caused by sound waves entering the ear and causing the eardrum to vibrate.

When an object moves at supersonic speed in the air, a wedge-shaped or cone-shaped wave will appear in its protruding part like a speedboat advancing in water, which is called a shock wave. The dense sound waves emitted by the object cannot travel in front of the object, so they are all stacked on top of each other behind the object, forming a cone-shaped sound cone. As they propagate outward, they interfere and influence each other, and then merge into a sonic boom pre-shock wave and a trailing object post-shock wave. Although this wave can be compared to the wedge-shaped water wave described above, it has very different properties.

The thickness of the shock wave is very small, and the pressure, density, and temperature of the air suddenly increase after passing through the wave, and the speed decreases rapidly. When these two shock waves affect any space or object, they will feel this strong change, which will be reflected in the human ear, causing the eardrum to be subjected to a sudden change in air pressure, and it will feel like two thunderous loud noises. This sound is called a "sonic boom"!

Many people have heard of a sonic boom, but very few have seen it. When the plane is flying at a speed exceeding the speed of sound, just as the plane is about to accelerate through the sound barrier, a cloud of fog sometimes forms around the aircraft. This cloud is the sonic boom cloud mentioned earlier!

And Dong Han can actually see this scene in one person today!

The clone Dong Han grabbed the clone's head with his left hand, and the steel blade of his right arm slashed mercilessly. Three more machine soldiers fell!

Dong Han watched the machine soldiers being tortured and killed unilaterally, I really don't know what the origin of this clone is, the whole mutant! The machine soldiers are powerless! Do you have the ability to do so?

But Dong Han looked at his hand with a blank look, touched his sweaty cheeks tremblingly, shook his head and said, "It seems that I am still a normal person, so it's okay." ”

Suddenly, the remaining dozen or so robot soldiers fell to the ground at the same time. I didn't know and thought that I had surrendered with a white flag, but Dong Han knew that things were not as simple as he imagined. The white sphere floats directly above it again, seemingly emitting some kind of high-frequency sound wave. Dong Han's ears were shaken, and as the frequency became higher and higher, his head became more and more painful. Finally, when he was about to go into shock on his knees, the voice disappeared again. Frequencies are getting higher and higher to the point where human hearing alone can no longer capture them.

Dong Han trembled and stood up his body, and when he saw the clone Dong Han in the distance, he also looked like his head hurting, so he slowly got up. When they were in unbearable pain, the bodies of dozens of robot soldiers quickly rushed around the white sphere, and after a series of morphological changes, they compressed into a humanoid thing two meters high.

Only Dong Han tilted his head and squinted his head, scratched his ears and cheeks, and still felt that this thing was like a pile of scrap metal, lifeless.

But as a white light struck the blinding eyes, the white sphere grew smaller and smaller until it was only the size of a pearl. "Whoosh" with a sound and a smoke slipped into the body of the scrap metal.

The two-meter-tall scrap metal is constantly changing, sometimes turning into a black soft jelly-like shape, sometimes into a white halo-like shape. In fact, it was only a few seconds at best, and finally it continued to expand until the "thing" exploded and turned into a tall "woman".

In fact, Dong Han doesn't know if it's a "person", but she has fine black long hair, draped over her shoulders, which is slightly feminine. The eyebrows are slender and picturesque, the eyes are like hooks to seduce the soul, and the small red lips and the white of the skin are even more distinct. She has a fair and clean face, soft and fine skin, which can be broken by blowing. This woman is about thirty years old, wearing a black tight-fitting nano combat suit, Dong Han has never seen such a beautiful "woman" in his life.

The black tight-fitting nano battle suit tightened her amazingly good figure, a pair of snow-white that was about to come out, the scale was not too big, but the shape was beautiful. Dong Han swallowed his saliva and continued to look down. The leggings stretched out a plump arc, and the legs were also as slender as willows, although the slender snow-white legs were tightly wrapped in combat clothes, they still couldn't help but make Dong Han infinitely reverie.

This kind of stunner-like woman, Dong Han is really the first time to see it, and she is a stunner among stunners! Dong Han straightened his eyes. However, looking at the clone on the other side, Dong Han frowned, looking like he was facing a great enemy.