Liu Ying'er saw her sister crying sadly, and immediately asked with concern: "Sister, sister, what's wrong with you?"

After a while, Yu Xiao finally stopped crying, took out a handkerchief and wiped her tears, and said with a smile: "Silly sister, it's okay, my sister saw that Tian Gongzi's words were too beautiful, and she couldn't control it for a while, and cried excitedly." ”

"Why do you cry when it's beautifully written?"

"Silly girl, you will understand in the future," Yu Xiao wiped away her tears and said to Tian Zhiyu: "The slave family is rude, let Tian Gongzi laugh." ”

"Miss Yu Xiao has a good temperament, understand, understand," Tian Zhiyu hurriedly said: "Write these three songs first, if you go back, if you think you can use it, change it into a song, and use it for the time being." I'll write it for you later if you need it. ”

"The slave family has thanked Gongzi for his great kindness, these three songs have been enough for the slave family for a long time," Yu Xiao's eyes were still red and swollen, but his face was full of joy, and then said: "I just don't know if the slave family and my sister met Gongzi Pingshui, why did they help us like this?"

Tian Zhiyu thought of Su Yijin again, and said slowly: "Maybe it's because you and my sweetheart are from the same school, and they all have the same bumpy fate, when I see you, I think of her, and it's for her to help you." ”

"That sister is really blessed, to meet a talented and warm person like Tian Gongzi," Yu Xiao couldn't help but envy: "There is still something unknown in the slave family, why would a person like Gongzi get together with someone like Gongzi of the Feng family? ”

Tian Zhiyu said with a smile: "Actually, I have only been in Yuhang for half a month, and I am only a general friend with Feng Sigong. I once did a small favor to the Feng family, and their old man was very polite, and invited me to their house several times, and I got to know him after coming and going, and this was the first time we came out to play together. ”

"I see, I said, a character like Gongzi is definitely not worthy of the Feng family's son. ”

Tian Zhiyu smiled, and then said: "Actually, I still have some small songs that I can teach you, but now it's too late, you have to go back quickly, and when I have a chance in the future, I will sing those little songs to you." ”

Yu Xiao nodded hurriedly and said, "Dare to ask where the son's family lives? If it is convenient, the slave family can visit with his sister and learn from the teacher." ”

Tian Zhiyu told them where they lived, and Yu Xiao said: "It turned out to be the house of the boss of Ma Bencai Ma, the slave family knows where it is, I don't know when it will be convenient for the son, my sister and I went to visit." ”

"All my time is convenient, you can go whenever you have time," Tian Zhiyu stood up after speaking, and said, "You guys go back quickly, or your shopkeeper should be in a hurry in a while." ”

Yu Xiao and Liu Ying'er also hurriedly got up, Liu Ying'er was obviously very sleepy, her eyelids couldn't open, Yu Xiao made a big salute to Tian Zhiyu, and said: "The slave family has nothing to repay, if the son has any needs another day, Yu Xiao must saddle the horse before and after, and it is incumbent." ”

She saw Tian Zhiyu signaling to them, and was about to turn away, but hurriedly stepped forward and said, "I almost forgot just now, I haven't asked my son's full name yet." ”

"My name is Tian Zhiyu," Tian Zhiyu replied with a smile, and then turned to leave.

......

When he returned to the house, it was already deep, and Ullihan was already asleep. And he couldn't sleep when he was lying on the bed, so he just sat and practiced while thinking.

Remembering that on Chinese New Year's Eve in Taiyuan, he talked with Su Yijin and Wen Suyi at night, so happy and stress-free at that time, although Ma Bencai and Wu Lihan were in the Spring Festival with the girls, he was not envious at all, he preferred to talk with people in that kind of atmosphere.

Tonight too, no matter how Feng Sigong and the second prince spend the Spring Festival in their Furong tent, he still likes to sit and chat with Yu Xiao and Liu Ying'er, and recite some poems and songs.

It's a really, really comfortable feeling.

But it's not easy to think about yourself, although there are two confidantes who are alluring to the country and the city, but one has to wait two years before he can move, and the other has to come to the door to propose before he dares to move, and he doesn't like to look for flowers and ask willows, his virgin body, I don't know when it will end.

He remembered Su Yijin's small mouth again, and his heart was hot.

When he woke up the next day, he told Ulhan that he was going to find someone to build a greenhouse, and Ulhan went out with him.

The two of them found the craftsman who had helped him build the wooden house, and when the man saw that it was him, he immediately smiled, and after hearing his explanation, he immediately agreed.

When the craftsman brought in all the craftsmen from the previous days, Tian Zhiyu said the scale of the greenhouse he wanted to build, and several people gathered around to compare and compare, constantly discuss, and finally listed the materials needed.

Tian Zhiyu told the craftsman that he was solely responsible, and gave them enough silver taels for them to help with the purchase, and the craftsmen liked him to be generous, and people did not have the slightest shelf, so there was no one who did not agree to his request, so he took the silver and began to prepare.

The two went to He Xingzhi's house again to see how the needles were made.

When Old Man He saw the two of them, he said happily: "I was just about to have someone inform you, but it happened that the two of you came, I made that thing, let's go, follow me to have a look." ”

followed Old Man He to his room, watched him pull a wooden box from the table, and after opening it, he saw layers of red cloth wrapping, and after uncovering the red cloth layer by layer, Tian Zhiyu saw more than a dozen needles lying inside.

Although it is still much bigger than those delicate needles in later generations, Tian Zhiyu is already very satisfied.

"Zhiyu, can you see if this is okay?" He Xingzhi said to Tian Zhiyu with a smile.

Tian Zhiyu took out one of the yellow ones, the weight of copper was heavy and very textured.

This needle is about 10 centimeters, and the tip of the needle is very finely polished, and it looks like it is shining. And the other end is exactly what Tian Zhiyu requested, which is much thicker, so that it is easy to connect to the pipe.

"Zhiyu, how's it going?

Tian Zhiyu nodded and said, "It's totally okay, old man, you are really amazing, and the production is so exquisite." ”

He Xingzhi smiled modestly and said, "It's really a toss, but it's good to meet the requirements." ”

"Old man, how is this made?" Tian Zhiyu was a little curious.

He Xingzhi: "Actually, it's not difficult, first cast a very thin layer of copper sheet, and then prepare a very, very thin copper wire, which has to be polished very smooth." Wrap the copper sheet on the copper wire, remove the excess part, and then make the copper sheet completely fused at high temperature, and then find a way to extract the copper wire, so that the prototype of this thing comes out. ”

"Then I just try to find a way to grind this small copper pipe again, and keep polishing it, and finally after it is so fine, grind one end hard again, grind it to such a sharp point, and find a way to connect a thicker copper pipe at the other end, and polish it a few times, isn't this it?"

Tian Zhiyu knew that what the old man said was simple, but the process of doing it must have taken a lot of twists and turns, he looked at the needles in the wooden box, and said gratefully: "Thank you so much, old man, with this thing, it will be more convenient for the divine doctor to save people and cure diseases in the future, and his old man will definitely be very satisfied, thank you very much." ”

"No, no, my work is insignificant compared to the divine doctor, and besides, the divine doctor also saved my wife's life, this little thing should still be done. ”

Tian Zhiyu packed up the wooden box and asked the price of these needles, but the old man He Xingzhi insisted on not wanting to, and when he saw that Tian Zhiyu had to give him money, the old man angrily kicked them out of the door.

"What an old man with personality," Tian Zhiyu said with a smile.

Originally, there were still many things that needed to be bought, but Tian Zhiyu thought that since he wanted to make a greenhouse, he would still wait for the greenhouse to be finished and then buy it together, anyway, the cultivation of vegetables and fruits was not a matter of three days or two days.

The two of them rushed to the house of the divine doctor Fu Zhu non-stop, and after the divine doctor saw the needle in Tian Zhiyu's hand, although his face was very happy, he was still suspicious in his heart.

"Divine doctor, let's experiment and see the effect of using this blood transfusion. In order to dispel the doubts of the miracle doctor, Tian Zhiyu still felt that it was better to do an experiment.

"How?" asked the doctor.

"Why don't you do an experiment with two rabbits," Tian Zhiyu thought that in later life, medical schools would use rabbits and mice to do experiments, and felt that rabbits should be a good choice.

"Okay," a few people came to the miracle doctor's laboratory, and Jing Lian and Jing Song chose a rabbit and hugged it in front of them.

Tian Zhiyu first fixed the tube made of the small intestine of the animal by the divine doctor to the thick ends of the two needles, and then asked the divine doctor: "Where is the thickest blood vessel of this rabbit?"

The divine doctor asked Jing Lian to point it out to him, Tian Zhiyu gave the two needles to Jing Lian and Jing Song respectively, and said, "The two of you are responsible for one end," he asked Jing Lian to insert the needle into the rabbit's artery first, and as soon as Jing Lian inserted it, the rabbit's blood immediately left out along the tube.

Jing Song just saw the rabbit's blood flowing into the tube, and the needle at his end had spurted out a large amount of blood, and the divine doctor looked at it and exclaimed incredible.

Tian Zhiyu hurriedly walked over, pinched the tube first to prevent the blood from flowing out, and then said to Jing Song: "Check the needle on the rabbit." ”

After Jing Song did this, Tian Zhiyu let go of his hand and asked Jing Lian to raise his rabbit a little higher, and then several people watched as the blood of one rabbit continued to flow into the other.

Unfortunately, the rabbit that was transfused died soon after.

The divine doctor still felt incredible, and said, "The old man didn't expect that such a thin needle would bleed so fast and cause rain, why is this?"

Tian Zhiyu couldn't explain the blood pressure to him, so he could only use popular words: "Divine doctor, in fact, the blood flow in each of our bodies is because of the beating of the heart." If the heart stops beating, the blood won't flow. ”

The divine doctor nodded and said, "I know that. ”

Tian Zhiyu continued: "The reason why the heart's beating allows the blood to flow continuously is actually because it creates a certain amount of pressure in the blood vessels, and the pressure is, for example, when I press the table with my hand, I give the table a pressure, and similarly, the blood flow in the blood vessels is also because of the pressure. ”

"When you say this, the old man seems to vaguely understand, but how much pressure can this pressure be?"

"It's very big," Tian Zhiyu said: "Divine Doctor, you should have seen that after the blood vessels in a person's neck are cut, blood will spurt out, and that is because of the blood pressure." ”

The Divine Doctor nodded.

Tian Zhiyu continued: "In the same way, when the needle is inserted into the blood vessel, the pressure of the blood will make the blood flow out continuously. Although the needle is very thin, the pressure is high enough, so the blood flows out very quickly. ”

The divine doctor had already understood it in a trance, and the rest only had to be thoroughly understood by himself after recalling it.

"Just now I asked Jinglian to lift the rabbit in charge of blood transfusion high, because after the blood enters the tube, there is a force to fall, plus the pressure of the blood, there is enough strength to let the blood enter the rabbit that is being transfused, that's the reason. ”

The divine doctor thought about it again and said, "It's really exquisite, it's seamless, it's seamless, and you're so smart about the rain." With that, the doctor gave him a thumbs up.

Tian Zhiyu smiled shyly, thinking to himself that I hadn't made full use of the wisdom of later generations, these are the truths that countless scientists have spent hundreds of years summing up.

The divine doctor couldn't enjoy it, so he asked Jing Lian and Jing Song to find a few rabbits to experiment, although Tian Zhiyu didn't feel sorry for those little rabbits, he really couldn't bear to watch them die all the time, so he made an excuse and left them to continue the experiment, and he slipped out.

After the miracle doctor had seen it, he spared the remaining rabbits, took Tian Zhiyu's hand and returned to his house, still praising Tian Zhiyu constantly.

After Tian Zhiyu was modest, he continued: "Divine doctor, because this needle is very troublesome to make, it can only be reused continuously. However, after each use, you have to wash it with water quickly, and you have to disinfect it before the next use. ”

"This old man knows that this is the same as a scalpel and a silver needle, which must be roasted over fire before each use," the doctor laughed.

This truth has been passed down for a long time, but Tian Zhiyu guesses that they only know how to do it, but they don't know why they want to do it, and bacteriology and virology also need to be vigorously popularized.

It's a pity that in this regard, Tian Zhiyu only knows a little bit about it, and he has no way to popularize science for people in this world.