Most cities in China do not have systematic drainage pipes, and some use streets and rivers to drain water, which affects environmental sanitation. Some cities have low drainage capacity, resulting in water accumulation for a long time after rain in some cities, which has a great impact on life and production.

From the perspective of environmental protection, drainage projects have the role of protecting and improving the environment and eliminating the hazards of sewage.

In 1865, London's underground drainage pipes, with a total length of more than 1,700 kilometers, were discharged into the sea. His underground drainage system, in some places looks like a giant underground palace.

In 2006, Tokyo completed the world's most advanced sewer drainage system, which is rated "once in five to ten years" and consists of a series of concrete pits with an underground river depth of 60 meters.

The Chinese country really began to pay attention to the underground drainage system, since the beginning of this century, Shashi, as the provincial capital, tens of millions of people in the central metropolis, after hundreds of years of improvement, the underground drainage system is naturally extremely developed.

Zhang Zhi followed the sound and found a diversion hall, which was like a huge cave, with more than 30 concrete pillars tens of meters high. The small searchlight on his hard hat made it impossible to see the full extent of the space.

But Zhang Zhi knows that he is here!

"Meow~!"

A slight cry made Zhang Zhi judge the cat's location, and when he turned his head, he saw a protruding platform on a half-meter-diameter cylinder, and the two bright lights were like ghosts in the night.

"A black cat!" Zhang Zhi judged instantly.

Under the faint searchlight, a big cat like a tiger was entrenched there, its eyes shining with a terrifying light.

It is not an exaggeration to say that this is a tiger, because his size is already a meter long, although it is not as good as a real tiger, but it is really unreasonable to say that he is a cat.

"Meow~!"

With a soft scream, the big cat pounced on Zhang Zhi, and from a distance of twenty or thirty meters, it went directly to the top of Zhang Zhi's head.

Zhang Zhi picked up the stick and hit the black cat, the black cat seemed to know that the stick was lethal, and suddenly it stretched out its front paws, swept on the stick, and its body turned around, and then borrowed its strength to another pillar.

"Meow~!" The meow became a little shrill and harsh, and it was clear that the big cat was angry.

Zhang Zhi was even more angry, and knocked a stick towards the pillar, but the cat actually knew that it was powerful, and turned around and jumped on the other pillar.

"Trick me?" Zhang Zhi is not in a hurry, this cat's wisdom is not low, but compared to people, it should be worse.

"Boom, boom!" After a few hits in a row, the pillar was knocked by Zhang Zhi and trembled, and the cat hair didn't touch a single one.

"This cat's strength is good, but it's a pity that during the exercise, there is no time for me to use my god control skills, otherwise I will try it."

A person and a cat chase in this space, but it also seems spacious. A few minutes later, Zhang Zhi pretended to sell a flaw, poured the stick on the ground, and looked tired and out of breath.

Sure enough, the big cat seemed to find that the time had come, and the opponent was tired of flying a kite by himself, so he stretched out his paws and grabbed at the defenseless Zhang Zhi.

"If you did this earlier, there would have been nothing to do." Zhang Zhi was overjoyed, and suddenly punched and hit the big cat door.

But this cat, at this time, can still react, which is also peculiar. I saw that the cat suddenly turned around in the air, and the door went down, and Zhang Zhi punched the big cat on the left back.

"Click!"

This is the subtle sound of a broken rib, the big cat took advantage of the situation to land, turned around and fled, he knew that he had been tricked, and the opponent was too strong.

Zhang Zhi turned around and picked up the stick, following the sound and chasing after him.

After chasing for a few hundred meters, the big cat turned around and entered a branch plastic pipe, Zhang Zhi also slid into it without hesitation, and the cat knew that after Zhang Zhi chased after him, he actually found a pipe staircase and climbed directly to the ground.

"Huh? Aren't you even less advantageous when you go to the ground? ”

Zhang Zhi followed without hesitation, only to see that the cat was really like a small tiger, running fast.

But Zhang Zhi had already injured him, the cat ran for three or four miles, and after all, he was caught up by Zhang Zhi, knocked down with a stick, the cat turned around, let go of the stick, and continued to run, and in his mouth, there was an extremely sharp cry, as if calling for something.

Zhang Zhicai didn't care, picked up the stick and continued to smash it.

"Bang!"

Missed again.

"Psychic Spike!"

Seeing that the big cat was about to get into a building, Zhang Zhi finally used a killer weapon.

When he got to the building, he had to play hide and seek with a cat, and he didn't have the patience to do so.

The qualitative energy stab burst into the big cat's brain, causing it to let out a terrible scream, and its body suddenly rolled on the ground, obviously the nervous system was broken through, and the stinging pain would make it extremely uncomfortable.

Taking advantage of this opportunity, Zhang Zhi slammed it down with a stick.

"Stop!" A loud shout came from a distance, which made Zhang Zhileng pause, but where could the stick be withdrawn at this time, and he didn't plan to take it back.

"Poof!"

With a muffled sound, the big cat's head was directly smashed by Zhang Zhi, and the brain and blood spurted out, and the big cat died so much that it couldn't die anymore.

Zhang Zhi breathed a sigh of relief, his spirit was a little weak, but after all, the big cat died. But when he looked up, a young man in a black polo shirt and blue plaid slacks was rushing over with an angry face, holding an eighty-centimeter-long thick-backed knife in his hand.

When the knife reaches this length, it is already very long.

But Zhang Zhi didn't pay attention to it.

"I told you to stop, you even made a dead hand, are you tired of being alive?" Although the person in front of him was young, he was full of evil spirits, and he had obviously killed a lot of zombies.

"I'm not tired, but this cat is tired, he took the initiative to attack me first, and he is not allowed to fight back?" The other party didn't make a move, and Zhang Zhi didn't attack first, after all, everyone is a civilized person.

"Okay, even if what you said is true, then I already told you to stop just now, and you still kill. Since you killed the cat I controlled, it proves that you have some skills, and my cat is not an ordinary product. But no matter how powerful you are now, I can't keep you, so let's die! ”

Zhang Zhi sighed, this person is too confident, didn't he see himself holding such a long stick, could he be an ordinary person?

Can you use a knife to chop such a thick steel rod?

The long knife swept over directly, and Zhang Zhi picked up the stick and prepared to block the opponent's long knife directly.

At this moment, a strange scene happened, Zhang Zhige blocked it, only felt a light in his hand, and thought that he was empty, and when he looked closely, he saw the long knife slashing towards his arm, and the speed was just a pause.

"Whew!" Although Zhang Zhi leaned back with the fastest reaction, he was still slashed by the tip of the knife on his arm, and a cool feeling passed, which was a hot pain.

"Ding Dong!"

It's the sound of a falling to the ground.

The steel rod was cut into two sections with a knife, and Zhang Zhi only had more than a meter long left in his hand.

"What's the situation?" Zhang Zhi was a little confused.

"Humph! As far as your knowledge is concerned, you think you are invincible in the world with a little strength, my knife is a synthesis of nanomaterials, ordinary steel, how different from tofu! ”

"Whew!" With a knife again, Zhang Zhi had no choice but to take three steps back, but he didn't lose half of the big stick in his hand.

No matter how fast the blade is, if it doesn't hit it hard, then there is no chance of cutting.

The opponent attacked seven or eight moves in a row, and Zhang Zhi finally regained the rhythm of the battle. The initial defeat was just an accident.

The sound of gold and iron continued to be heard on the streets, attracting a lot of zombies, but no matter what zombies, they were all solved by the two of them, and they couldn't affect the battle between the two.

Zhang Zhiqiang is physically strong and has a strong sense of fighting, while the opponent relies on the convenience of sharp weapons to open and close and seek opportunities.

The two fought for more than ten minutes, and sometimes jumped away to kill the zombies that surrounded them, and they were all sweating. The opponent's eyes gradually became solemn, and after a long battle, he finally faced the opponent.

There was a gap, the two sides jumped away, and the young man pulled his knife and leaned the knife against his back and said: "Report your name, you shouldn't be a nobody!" ”

"Zhang Zhi! Ready to fight! "If you continue to fight, Zhang Zhi is confident that he can win, his physical fitness is stronger, and he has recovered his spirit, then he has the chance to win, unless the other party's mental power is also strong, if this cat is raised by him, then he is not afraid, if it is controlled by the god control skill, it proves that the opponent's spirit is at least four points, and the impact of that level of spiritual skills is limited, it is impossible to lose, and it will be a little difficult to win.

"It turned out to be a star list powerhouse, and I'll come back to you again at this end today. You killed my cat today, this is a big revenge, I Lin Tianzhi will take revenge, you wait! ”

After speaking, Lin Tianzhi picked up the corpse of the big cat, and strode away like this.

Zhang Zhi didn't chase either, after all, he didn't have the certainty of killing the other party.