"Yes." For Li Daozong's timely change of words, Pharmacist Li was obviously quite satisfied, and said with a smile on his chin: "Enter Guanzhong from Hanzhong, or go out of Qishan, or cross the Qinling Mountains."

In that year, when we crossed the Qinling Mountains, there were only two roads: meridian and scattered passes.

It is rumored that Han Xin once repaired the plank road on the meridian road, but went to the Sanguan Road to secretly cross Chencang. ”

"Sanguan Road" is also known as "Chen Cang Road".

At this time, he continued: "In fact, at that time, Emperor Gao used Fan Hao and Guan Ying to feint to attack Qishan, and Han Xin to attack Chen Cang. ”

Li Daozong asked again: "Now there are four paths through the Qinling Mountains, but I don't know when the two paths of Bao Xian and Fu Luo were completed?" ”

Li Yaoshi said: "The Bao Shu Dao was completed in the Later Lu Period, and the Fu Luo Dao was completed in the Three Kingdoms Period. ”

Li Daozong pondered for a moment and continued to ask: "In this way, then Han Xin can only go north through the Qinling Mountains. The Northern Expedition of Wuhou can not only go out of Qishan, but also pass through the Qinling Mountains. Why can Han Xin succeed and Wu Hou not? ”

"Dazai asked!" Pharmacist Li high-fived and praised: "During the Wuhou period, Fu Luo Dao had not yet been cultivated. In the first year, Cao Shuang cut down Shu, and only then did he cross the Qinling Mountains from Luogu to the south for the first time. During the Ganlu period, Jiang Wei went from the north of Luogu to the south. ”

"Zhengshi" is the first era name of Cao Fang, the young emperor of Cao Wei, and "manna" is the second era name of Cao Chao, another young emperor of Cao Wei.

Cao Wei successively had three young emperors, Cao Fang, Cao Chao, and Cao Huan.

"As for the ...... of the Praise Slope Road," Pharmacist Li continued: "During the Lu Hou period, the earthquake caused the Qiang Road and Wudu Road landslides, and the Sanguan Ancient Road mountain collapsed on a large scale. After that, not only did the road take a twist and turn, but it was no longer passable......"

At this time, Pharmacist Li's eyes swept over the people in front of him, but he saw that Su Dingfang had a sudden realization.

Later, the courtiers wrote to the courtiers and asked for the repair of the praise ramp. The Baogu Valley and the inclined valley were chiseled through, and the Qinling Mountains were crossed by land, which was not only smoother than the Sanguan Road after the earthquake, but also had a journey of 400 miles less. If the waterway is taken, whether it is through the Baoshui to the south to the water, or from the diagonal water north to the Weishui, it can be transported. The source of these two rivers and mountains is only more than 100 miles apart. ”

"Shuishui" refers to the west Han water of the west source of the Jialing River today, and "Baoshui" is its tributary.

"Xieshui" was also known as Wugong Water in ancient times, and today it is called Taochuan River and Stone River, which is a tributary of the south bank of Weishui.

At this time, Li Daozong also understood: "Therefore, the grain and straw transported by the Bao Slope Road can be entered from Nanyang through the Shuishui, and the boat can go downstream, and when it is impossible to move forward, it will be transferred to land transportation, and then enter the inclined water, so that it can go straight down to the Weishui." ”

He nodded and said: "The slanted water enters the Weishui in Yixian County, and at that time Yixian was under the possession of Cao Wei, so Wuhou could not transport grain through the Baoxian Road. ”

Pharmacist Li praised: "Yes! ”

Xue Guwu also understood: "So when Wuhou was in the past, Fu Luo Road had not yet been completed, and the north entrance of Meridian Road and Baoxie Road were all occupied by Cao Wei, and the old road of Sanguan collapsed, and it was no longer possible to pass through the Cao Yun ......."

I only heard Xue Wanche rush to say: "Therefore, if Wuhou crosses the Qinling Mountains, he can only go through the Sanguan Road." However, the grain was also transported through the Sanguan Road, and Han Xin was safe, but Wuhou had to build another wooden ox and flowing horse. ”

Pharmacist Li nodded frequently: "Yes!" Yes! ”

Xue Guwu asked: "It is said that in the old days, the water went straight to the Han River, but ? ”

After all, he went to the south with Pharmacist Li and lived in Kuizhou for more than a year.

Pharmacist Li nodded and said, "That's true. Legend has it that in ancient times, there was a great heaven and earth, and it was great! "Zhuangzi" compares it with heaven and earth, saying: "The four seas are between heaven and earth, not like the emptiness in Dazehu?" The water is poured into this ze, and the outflow is Han water. The vastness of its water is like the so-called "Weitian Han" in the Book of Songs, so the name is called Han water. ”

Speaking of this, Pharmacist Li unconsciously looked towards the sky.

It was the beginning of July, the sky was getting dark, and a heavenly river in the starry sky, from the northeast to the southwest, was like a rushing rapid, pouring for thousands of miles.

Pharmacist Li continued: "After the earthquake in the later years of Lu and the landslides of Qiang Dao and Wudu Dao, the Daze Pass of Heaven and Earth was broken, and the water overflowed to the south, flowing into the Chongqing River, and no longer into the Han River. ”

"Yushui" is the ancient name of the Jialing River.

Su Dingfang never opened his mouth, and at this time, he looked at the stars in the sky with this teacher, but suddenly blurted out: "Xiangjun! ”

For a while, he didn't seem to know how to continue.

Pharmacist Li's eyes were full of encouragement: "There are no outsiders here, but it doesn't hurt to say it." ”

"Yes!"

Su Dingfang bowed in response, and immediately said: "If we are marching on a sunny day, we can clarify the direction according to the position of the sun during the day, and observe the stars at night. However, if it rains or snows, sometimes you get lost. ”

He looked at Pharmacist Li, but saw that this master was still full of encouragement, so he continued: "The spar explained by the previous Xiangjun only has the light of the sky, and it is not necessary to see the sun wheel, and the position of the sun can be determined by the transmission of light. In this way, even if you encounter rain, wind and snow to obscure the sky, or even in the miasma of mountain smoke, you can still clarify the direction through the spar. ”

Li Daozong and the other four didn't know about the spar, so they were very curious and asked one after another.

Su Dingfang said with a smile: "Now that I don't have a spar at hand, I don't know where to start." Let's wait until we return to the camp tomorrow, and we will find out. ”

That night, the group spent the night in the stone room where Taigongwang once lived.

It was Mengqiu, the heat had not disappeared, and it was absolutely refreshing to sleep in this secluded and dense mountain with beautiful forest barriers.

The next morning, I returned north.

During the emperor's summer vacation, the central cabinet members could borrow the official residence, and the rest of the people could only camp and sleep.

Li Daozong was anxious to learn about the spare, and immediately asked Su Dingfang to fetch the spare, so that several people could go to his official residence for details.

Pharmacist Li returned to the official residence in Xiangchuan, but unexpectedly, the deacons were anxiously waiting, reporting that the prince had come to visit and left a gift.

So he hurriedly changed into his official uniform and entered the Jiucheng Palace to thank him.

Unexpectedly, as soon as Li Chenggan saw Pharmacist Li, he was like seeing a relative, and pulled him and asked: "Teacher, Jiucheng Palace is in the summer, why didn't De Jian and De Award come together?" ”

Pharmacist Li replied: "Your Highness, De Jian served as a general as a supervisor, and he went back and forth many times when he repaired Jiucheng Palace. After completing the cultivation, he went to martial arts and continued to serve as a prisoner. The German Award has not yet been inducted, so it has not come with it. ”

When Li Chenggan heard this, his face was full of grievances, and he was all begging: "Teacher, if you have time after the recent court meeting, can you come and teach me martial arts?" ”

A year ago, Li Chenggan stopped practicing martial arts after his legs and feet were dry due to wind disease.

Then the young master of the crown prince, Li Gang, died, he was the chief professor of the East Palace, but because of his advanced age, although he was careful about Li Chenggan's cultivation, he was not very strict.

After his death, the teaching of the East Palace was led by Yu Zhining, the left concubine, and Kong Yingda, the right concubine.

Both of them are university scholars, but unfortunately they don't understand the psychology of teenagers, but they are kind and kind-hearted, and their requirements for the prince are too strict.