Outside Chang'an City, the Laoyu River, one of the eight rivers, has become very lively.

A wooden transport team composed of nearly a thousand soldiers was busy, with some pulling in front, some helping behind, and some standing next to a huge wooden rack on the shore, easily lifting a bundle of ten pieces of wood with two ropes.

There was another person on each side of the wooden shelf pulling the rope, pulling the wood to the vast plain on the shore.

Changsun Wuji and the other two walked among the busy and orderly crowd. Looking carefully, they seemed to be easy to do work, and they were happy and were very energetic.

The two sides of the Taiwan Strait were filled with people watching the fun. They saw piles of sturdy wood being transported over, especially when they saw another bundle of wood hanging from the ice. There were only two people carrying the hanging, and they immediately applauded and cheered happily.

The scene was very lively and the atmosphere was like the time of the Spring Festival. Watch the artist dance dragon lanterns.

What was incompatible with this excitement was that Changsun Wuji's face turned pale and bloodless, and his whole body was trembling with anger.

"Ice-surface transporting wood? Cheng Yaojin has a good method! I don't believe that such a good method is thought of by his pig head! Check it out! Find out who has created this good strategy for me, and I want to tear this person apart."

Changsun Jing, who had asked about the soldiers around him, rushed back quickly and reported to Changsun Wuji: "Aye, I found out that the person who offered this good strategy was Wen Linlang, the mansion soldier, whose name was Ni Tu."

"Ni Tu?"

"Ni Tu?"

Changsun Wuji and Changsun Run shouted in unison.

"What's wrong? You know this person?"

Changsun Wuji sneered: "It's not just about knowing each other, he is irreconcilable with our Changsun family!"

Changsun Run also gritted his teeth and said, "Snatching someone's wife is like killing someone's parents. He is my Changsun Run's rival. I will tear this person to pieces with my own hands."

"Ah? Haha..." Changsun Jing finally waited to see the jokes from others. He didn't follow Aye and his younger brother and was so angry that he laughed wildly: "The twelfth brother actually has today. Don't you always boast that all the girls in the world are confused by your talent and beauty? Why, your little wife was bullied? Haha, it's fun! Fun! Ahhhh, Aye, please don't do it! A gentleman doesn't do it!"

Changsun Jing was beaten by Changsun Wuji and begged for mercy, and quickly ran towards the carriage.

Changsun Wuji and Changsun Run also quickly chased after him, and there was nowhere to vent their anger in their hearts, so they could only find this guy who was turning his elbow out.

As soon as Changsun Wuji's carriage drove away from the scene, Cheng Yaojin, Cheng Zheng, Ni Tu and others arrived on the huge open space outside Chang'an City.

Looking at Chang'an City from afar, Cheng Yaojin was filled with emotion: "The general is away and he will not accept military orders. Your Majesty, you should take care of the dragon body."

"Aye, you want to go back to see the grandma and pay homage to His Majesty. Then you go back, there are children here watching."

"What are you talking about? We are all military personnel. Since we have received military orders to carry out military missions, we cannot return to Beijing without a single step. Zheng'er, you must remember in the future that you must not leave the military camp without military orders. That is the crime of beheading."

"Grandson remembers it!"

After receiving the earnest teachings, Cheng Zheng became arrogant because the people on both sides of the Taiwan Strait were cheering for them:

"Duke Lu is mighty!"

"Thank you for your hard work in Duke Lu!"

"Duke Lu is really a genius of my Tang Dynasty! Today I have opened my eyes!"

Cheng Yaojin rode on the horse, clasped his fists and bowed to the people on both sides to return the gift.

Looking at Ahon, whose eyes were filled with tears, Cheng Zheng felt that he had done something very big.

What is a competent military person? Become the hearts of the people, follow the wishes of the people, and be supported and loved by the people.

"How can these dozen soldiers who are as thin as little chickens have such strength? Can they lift up a bundle of ten trees with a rope at once?" Cheng Yaojin got off the horse and walked back and forth at the scene. When he came to a high shelf, he pinched his waist and asked.

"Can that Goudan have the strength to me? Impossible! Every time I wrestle my arm, I can only use half a piece of strength to pull him down." Jia Er said unconvincedly, pointing at a weak Goudan.

"Goudan'er, please get out of the way! Let me try it! Let me see if I am strong or yours!" Cheng Zheng spat in his palm, came to Goudan, and reached out to pick up the rope.

Gou Dan'er smiled and said, "Captain, this requires skill, and it requires full strength to pull it. You also need to learn to distribute your strength equally, otherwise you will be exhausted in a while."

"Don't talk nonsense, let me do it!"

Gou Dan'er smiled maliciously and handed the rope out.

The soldiers around also showed cunning joy.

Cheng Zheng thought everyone was questioning that he was not as strong as Gou Dan'er, so he worked hard to pull the rope.

As a result, with a force, unexpectedly, the rope suddenly took off, Cheng Zheng was stabbed into the snow and a strong dog came to chew.

"Ha ha……"

There was a burst of laughter at the scene.

Even Cheng Yaojin laughed so hard that he leaned back and forth.

Cheng Zheng finally got up and pulled the rope again. Suddenly he felt that he could pull a bundle of wood with just a little effort, and he could easily walk a few steps forward.

Cheng Zheng suddenly realized that Gou Dan'er's words just now were clearly playing with him.

"Goudan'er, get over here!"

"Ha ha……"

"Ah! The lieutenant, please spare me!"

Cheng Yaojin picked up the rope and tried it repeatedly several times, praising it endlessly.

"What is the reason for the wheels on it? How can it bear such a large weight?" Cheng Yaojin looked up and observed the strange wheels at the top.

There is a groove around each wheel. Once the rope is pulled, the small wheel can rotate about the axis.

Dozens of such wheels form a group, passing the rope back and forth, and people can pull the heavy wood with just a little effort.

Cheng Yaojin looked at it for a long time, but before he could understand it, he turned his head to ask Ni Tu.

Ni Tu smiled and replied: "This is a set of pulleys."

"Pulley? Just a few small wheels can pull such heavy things. What's the reason?"

Ni Tu knew in his heart, but he didn't know how to answer him.

Tell him about the definition of pulleys taught by the teacher. A simple machine composed of a disc with grooves that can rotate about the central axis and a flexible cable that can rotate around the central axis is called a pulley.

Tell him about the role of the pulley taught by the teacher. The pulley can pull the load, change the direction of force application, and transmit power.

The machinery composed of multiple pulleys taught by him, the teacher is called a "pulley set" or "complex pulley". The pulley set has a greater mechanical benefit and can pull heavier loads. The pulley can also become a component of chain transmission or belt transmission, transmitting power from one rotation shaft to another.

Tell him about the difference between fixed pulleys, moving pulleys and pulley sets taught by the teacher? How to use the principle of leverage?

Ni Tu thought for a while, shook his head and said, "This is a unique secret passed down by the teacher, and it cannot be passed down from outside."

"Ah! Ah Weng, don't fight! Don't fight! I'll do it, I'll do it all!" Ni Tu was still proud just now, but he didn't expect that Cheng Yaojin was lifted up with one hand and put it on his leg and beat him up.
Chapter completed!