Although the Yalu River is turbulent, the southeast wind in summer can still carry ships upstream, as long as you choose a windy day.

"In winter, the wind always blows from the northwest, but in the Xia family, the wind always blows from the southeast. What do you think is going on, Chief Steward?"

Wang Zheng pondered for a moment and said, "According to my observation, it should be thermal expansion and thermal contraction. I don't know if it is correct."

Li Zhi smiled and said, "The explanation given by the chief steward should be the closest to the real answer. Whether it is right or wrong, it is worth hearing. Tell me, what is this thermal expansion and contraction?"

"It's like boiling water in a pot. If you keep adding heat, the water will expand and evaporate. The weather in the south is hot, and the sea is exposed, so the seawater will naturally evaporate under the scorching sun. After the water vapor rises into the air, it will flow to the cold north, and naturally form the southeast wind."

"What about the northwest wind?"

"Haha, after the water vapor is brought to the north, it snows in the winter, and the snow piles up in the north. The space is occupied, and the air is naturally squeezed to the south."

It was not until they were about to enter the city that Wang Ying hurried over to greet them, which made Wang Zheng frown a little, but Li Zhi looked very happy.

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In the past, ships were mainly used to transport food. Now, except for places affected by disasters, there is basically no long-distance transportation of food. Even if a city is short of food, it can be met by circulating it in nearby counties and cities.

Now the King of Bohai, like the chiefs of the seven Mohe tribes, have all become Wu You's subordinates. They are usually mainly responsible for the tribal sacrificial activities. They have been allocated a large house and have a fixed salary every month. Together with the wealth they have accumulated, they live a good life.

According to Wu You, a tiny country dares to claim to be a king. The Second King has abolished so many royal titles in the Western Regions. It is called the capital, but it is not even as grand as a county in the Central Plains.

Li Zhi laughed and said, "Haha, the ink ground by the chief steward is also unique."

You are called a king, but you are just a tribal chief. If you don't obey, the seven Mohe tribes will destroy you.

Li Zhi raised his eyebrows and asked, "Why is that?"

Then everyone entered the city. Li Zhi looked at the streets in the city which were only three meters wide and the low wooden houses. He couldn't help but frown. Compared with Lingnan, the gap was quite big. Fortunately, the people had rosy faces.

Wang Ying explained: "Every year in April, May and June, we can catch more than 100,000 kilograms of fish in a ten-day period. It's easy to catch, not much. She just goes for the novelty."

This place was originally the territory of Bohai Kingdom and also its capital. When the seven Mohe tribes and the Shiwei people surrendered to Wu You, many people of Bohai Kingdom also surrendered to Wu You. Afterwards, Bohai Kingdom submitted a letter of protest to Li Zhi. Wu You was so angry that he directly moved the Grand Administration Office to the capital.

Li Zhi spoke sincerely, but Wang Zheng was secretly resentful.

No king would want to live like that; living a miserable life is nothing more than this.

"The fourth one will handle it himself. Your Majesty, please give them some freedom."

Nowadays, ships are used to transport various processed items, among which various meats, wine and coal have the largest transportation volume. In addition, the transportation volume of cloth, medicinal materials and ironware is also not small.

Wang Zheng smiled and shook his head, saying, "Splashing ink is your Majesty's business. I am only grinding ink for you."

Although grain is cheap in the Tang Dynasty now, it can be processed into wine, various cakes, or raised into livestock, chickens and ducks. The profit can be much higher.

Li Zhi pulled the corner of his mouth and smiled, "It's a bit nonsense, but it also makes sense, and it seems to have formed a cycle. The water in the sea turns into snow in the north under the southeast wind, and the snow melts and returns to the sea."

Li Zhi nodded and said with a smile, "No need to be so polite, get up. I didn't inform you in advance. There are so many things to do, so it's understandable that I can't adjust the time. Where's the fourth brother?"

Then Li Zhi looked at Wang Zheng, who also looked helpless. "Your Majesty, please go into the city and rest first. When the fourth brother comes back, Your Majesty will punish him."

Li Zhi smiled casually, "You are too serious, Chief Steward. It is too early to talk about punishment. The Northeast is thriving. As long as we get things done, it doesn't matter what happens normally."

Wang Zheng smiled and said nothing more, but looked at both sides.

Li Zhi was also looking at the two banks and said with a smile, "The landscape is like a painting. The chief steward has a good ability in splashing ink."

"Your Majesty, I, Wang Ying, greet you. I am late in receiving you. Please forgive me, Your Majesty."

From the founding of the Tang Dynasty to the present day, there have been more than a dozen kings accumulated in Chang'an City, including those from the Central Plains and foreign races. They are usually not allowed to go out of the gate and are almost like livestock in a pen. Their role is to come out and dance during national celebrations to show off the emperor's martial arts.

Wang Ying curled his lips and replied, "Wu You has taken his men to the Shubin River to catch fish. I have already sent someone to inform them. It will take two days for them to return."

Wang Ying explained, "The Northeastern General Administration Office was originally located upstream of the Yalu River, and later moved to the East China Sea. It was only moved here last year, so it is a bit shabby. I'm sorry to make you laugh, Your Majesty."

Before entering the city, Li Zhi said with some emotion: "In fact, the King of Bohai can live in Chang'an. I can at least give him a title of Duke of a county."

Li Zhi was stunned, then smiled with a strange expression, "Are there a lot of fish in the river? Do we need our chief steward to catch them personally?"

After three days of boat ride, they changed to a horse carriage. The further north they went, the shorter the crops in the fields became, until they saw wheat seedlings just sprouting, and then they arrived at Wu You's Grand Administrator's Mansion.

The black soil in the Northeast is indeed very fertile. Now that the Dragon Boat Festival has just passed, the wheat seedlings in the fields have grown particularly vigorously. The sorghum in the distance is also growing very well. We can expect a good harvest this year.

Li Zhi smacked his lips and said with a smile, "That's interesting."

Li Zhi asked in confusion: "The people from Fusang came back here? Shouldn't they land in Silla?"

"The river where Wu You went fishing is called the Shubin River, which means the shore of the land. In fact, it also has another name called Laibin River, and its estuary is across the sea from the Fusang Island.

When the sea was calm, people could just row a raft over from Fusang. The wind was favorable in this season, so they could hang some clothes on the raft and sail with the wind.

Recently, Fuso has been blocking roads and coasts. Wu You has sent people to warn them several times. There may be a war next."

"Tsk tsk." Li Zhi was a little speechless.