Pei Xingjian ate a fruit and then made his stomach feel more comfortable. While walking to Di Renjie, he was talking to him in the Cheng Mansion. Di Renjie was surprised and said, "You entered Cheng Mansion this time and not only did you not have any problems, but you also came back well. Not only that, he also became Cheng Yaojin's closed disciple."

"Yes." Pei Xingjian nodded with a wry smile, "I can't believe it either."

Di Renjie said with a strange smile, "Yesterday His Majesty summoned you, and came out of the palace to ask your eunuch to find half of Chang'an and didn't ask where you were. It seemed that something happened. Shangguan Yi and the others discussed matters in Ganlu Hall overnight."

"What happened?" Pei Xingjian began to nervously look.

"The situation in the war situation in the West seems a bit nervous." Di Renjie said to Pei Xingjian, "I heard that Songtsen Gampo sent a letter. Now Rome has reached Dashi in the east. If Dashi changes."

"The trade route will change." Pei Xingjian immediately understood, "If Rome could take over the big food, then Persia would be in danger."

"I'm afraid it's not that simple." Di Renjie said to Pei Xingjian, "You go to the palace and have a look. I'll report your safety to the teacher."

Pei Xingjian hurriedly walked into Chengtian Gate, and did not rush to his Secretariat, but came to the Secretariat. Seeing that Pei Xingjian was coming, Chu Suiliang pulled him aside and asked, "Where did you go last night?"

"I'm in Cheng's Mansion, and I'm dealing with Cheng Yaojin."

"Do you know that Your Majesty summoned you last night?" Chu Suiliang said.

"I only know now."

Chu Suiliang glanced around and whispered, "This time the situation is a little bad. If Rome annexed the Dashi, then Persia will be in danger, and our plans for the trade route over the years are likely to fail."

"I naturally know that the tripartite alliance was also promoted by me."

"Now the Persian envoy is still in Chang'an, it seems that the Persian envoy is already very anxious." Chu Suiliang said.

Pei Xingjian thought for a long time and said, "To open up the current situation in the West, we must go through the sea trade in parallel, otherwise it will be difficult to tear open the Western territories. What we need most now is time. I will go to the Sea Trade Department to see, and the sea ships don't know what happened."

"Don't go." Chu Suiliang hurriedly grabbed Pei Xingjian, "Shangguan Yi went to the Hai Trade Department today, and the second wave of envoys from India and Persia had also passed the Hexi Corridor."

"Is the envoy here from India?" Pei Xingjian asked.

Chu Suiliang spoke solemnly, "But it was their war after all. Tianzhu and Persia were already in trouble in the face of Rome. They hoped to get the support of our Tang Dynasty. Now they were all afraid, and they were afraid that the Dashi would join forces with Rome to join forces to fight for the Eastern Expedition. This is what you are most worried about now. During this period, you must appease the Persian envoy and think about how to get the greatest benefits from it."

"I understand." Pei Xingjian nodded.

Maritime Trade Department

Shangguan Yi was telling Li Zhi what was happening now, "His Royal Highness, what Your Majesty now needs is an answer from the Sea Trade Department, when can the sea ships go to the South China Sea?"

Li Zhi sighed, "Uncle Shangguan, although our sea boats can go out to sea now, the South China Sea is a far sea after all."

"Your Majesty is very anxious." Shangguan Yi said.

Li Zhi pointed to the sea chart hanging on the wall and said, "Uncle Shangguan, look at the coastline of the South China Sea. The distance we have to pass through is thousands of miles apart. From the port of the East China Sea, the distance we sailed almost across the entire Central Plains. We will not be able to pass such a long route. Of course, we are still a little unclear about the limits of the current sea ships. What we can know now is that our ships can travel to Nanzhao. There is no problem. There is an unexplored coastline south of Nanzhao."

"The most complete method is to start releasing people along the coastline of the South China Sea, and set up transit and supply lines along the way, and thoroughly run through this route." Li Zhi continued, "Now Yan Liben is developing an iron ship. With the iron ship, we will go back and start opening the waterway."

"Iron Ship?" Shangguan Yi was puzzled.

Di Renjie smiled and said, "At first, I didn't know that the iron ship could be built, but with the guidance of the teacher, I found some ways. Yan Liben had already let the first iron ship go into the sea."

"How can iron build a ship?" Shangguan Yi was puzzled.

"This is the magic of knowledge. You can do it naturally with knowledge." Li Zhi spoke and pulled Shangguan Yi to a pond, "Uncle Shangguan, you see, this pond was also built by me to build a model of a sea ship."

As he said that, Li Zhi took out another iron boat, "Uncle Shangguan, see if this boat is made of iron."

Yan Liben put it in his hand and weighed it, "It's indeed made of iron."

"Actually, it's hollow inside." Li Zhi said as he put the iron ship on the water surface of the pond, and the whole ship floated steadily on the water.

Shangguan Yi looked at the scene and didn't dare to show up. He stared at the iron ship floating on the water, "How did you do it?"

"It's actually very simple." Li Zhi said as he took out a wooden board on the side, which was written with dense designs and some theories and relationships.

"The secret lies in these knowledge. At first, I used wooden blocks to experiment, and deduced the relationship from some of the same conditions and different conditions, and came to three conclusions: the buoyancy of sea water is greater than that of lake water, and things floating on the sea have nothing to do with weight and density. In my teacher's words, it is density. The buoyancy of sea water and the area under buoyancy are related to the weight of the ship."

Listening to these Shangguan Yi, he looked at the dense words on the wooden board, "These are all calculated."

"Actually, I was confused at the beginning. These things were inspired by the teacher. They were solved by inferences from the knowledge I learned from the Gu family and the knowledge from the academy." Li Zhi said, with a little proud expression.

Shangguan Yi was no longer interested in the small iron ship floating on the water, but looked at the inferences and theories on the wooden boards, as well as a series of calculations, and murmured to himself, "This is turning decay into magic. This academy was built right. Perhaps this is the real purpose of Gu Qing's construction academy. Knowledge may be more changed. No wonder Gu Qing was not interested in imperial power. With this knowledge, there is no place for the world to go and where can the world to accommodate him."
Chapter completed!