Naturally, Ah Di would not give the dog a chance to move the rescuers, so he rushed over like a small cannonball, kicked him in the back of the waist, and kicked him a dog to eat.

"Stinky girl, you dare to beat me again......" With the lessons learned from the last beating, the dog has stage fright before he starts, and he doesn't have the upper hand, and now he is even more disadvantaged.

Ah Di's fist rained down, and even before he started, he didn't forget to take off his shirt and skirt and put it on the big clean stone on the side, he did the same last time, so Sister Qingyou didn't find out.

Originally, Ah Di learned fist and foot kung fu in the house for a few years, and during this time he was looking for someone to "learn" from time to time, and his skills were more skilled, and the fight was more fierce.

But he didn't lose his mind, and he didn't greet the other party's fatal place, but picked out the place where it was not bad and it hurt very much.

"You, you ......" The dog was beaten speechless, glaring at his brother angrily, with shame in his eyes and even more fear.

"What am I?" Ah Di patted his hands and feet and the dust on his body, turned around and walked to the big stone, picked up the shirt and skirt and put it on slowly, and looked back at him, "You mean you want to tell my sister?" ”

The dog didn't speak, that's what he thought.

"Go ahead." Ah Di sneered, "But let me tell you, if you dare to go, I will see you beat you once, and I promise that next time it will be worse than this time, you can do it yourself." ”

After saying that, he didn't pay attention to the dog, turned around and left, Yu Guang glanced at Erxi who was hiding around the corner, and before the corners of his mouth could be hooked, Erxi turned his head and ran away like a ghost, and almost fell on his heels.

Ah Di sneered, laughed, turned around, his body trembled violently, and then raised a big smiling face, and quickly ran towards Li Qingyou.

"Sister, what are you doing with this stick?" Brother hugged Li Qingyou's arm, carefully coveted her eyes, and tried his best to hide the weakness in his eyes, I wonder if my sister saw the scene just now?

Li Qingyou really didn't see it, she went to Zhao Xiaoshan's house just now and got this stick back.

There was a big tree outside the back wall of Zhao's house, and Zhao Xiaoshan climbed the tree and sawed down the largest branch, peeled off the bark and polished it, and it became what it is now.

"Take it back and grind." Li Qingyou explained in a good mood, "Archimedes once said, give me a stick, and I can pry up the earth." ”

Give her a stick and she'll be able to pull the millstone.

"Who is Archimedes?" Ah Di blinked his big eyes, "What is the earth?" ”

Li Qingyou, "......"

How does this make her explain?

"Archimedes is a great ......" Li Qingyou looked at Adi's little face full of question marks, and automatically swallowed back the mathematician and physicist, otherwise he would definitely have to ask what mathematicians and physicists are, which would not be explained for a few days.

And due to the limitations of the times, even if she can explain clearly, Ah Di may not understand.

"He's a great guy, huh...... is the same person as Zhu Shijie. Li Qingyou used his limited historical knowledge to explain as much as possible, however......

"Who is Zhu Shijie? What does he do? "Ah Di is like a curious baby, and many times what Sister Qingyou says is diametrically opposed to what he once knew.

It's like Sister Qingyou said that the earth is round, it's a big round ball, so it's called the earth.

But how can a man walk on a ball?

Mr. Chair also said that the sky is round and the sky is round, so they can see it anywhere, and the earth is square, so they can walk on it.

But what Sister Qingyou said was reasonable, he didn't seem to be able to refute it, and he didn't want to refute it, in short, what Sister Qingyou said was right.

"Zhu Shijie is a mathematician, and his works "Four Yuan Baojian", "Zhang Qiu Jian's Arithmetic" and "Nine Chapters of Arithmetic" are all outstanding works." Li Qingyou, as a science and engineering woman, these are compulsory courses and foundations.

""Nine Chapters of Arithmetic" I know, it's arithmetic." Ah Di nodded.

Li Qingyou also breathed a sigh of relief, and finally explained.

When the sister and brother returned home, Brother Ah saw Sister Qingyou tie the long stick to the originally short handle of the grinding plate, and Brother A's problem came again.

"Originally, this stone mill was heavy enough, and if my sister put such a big stick on it, wouldn't it be a burden for nothing?"

"What is the principle of leverage?"

"Why does a lever pull a stone mill?"

Li Qingyou almost knelt down for him, the child has a curious attitude towards all unknown things, and she agrees with it, but she is too curious She really can't hold it, she is not Du Niang.

"Shut up and just watch." Li Qingyou's patience ran out, and he pointed to the stone mill, "Look, it's time to witness the miracle......

"What is a miracle?"

The previous pride was like a deflated ball, Li Qingyou looked at Ah Di weakly, "Can you read it first and then ask?" ”

Brother nodded, very well-behaved.

Then Li Qingyou began to demonstrate her "miracle", under the eyes of Ah Di who opened his mouth wide, surprised, happy and full of admiration, the joy of being able to pull the stone mill was not as great as the excitement that his little face brought to Li Qingyou.

The big obsidian-like eyes twinkled with small stars, like starry skies, and even as clear as spring water, and the peaks of the eyebrows flew obliquely into the temples, like through the willows.

The palm-sized face is like a pearl like jade, like walking on a brocade of flowers, abandoning all the prosperity of the world, and any jewelry is eclipsed next to him, and can only be reduced to a foil.

That's all there is to it, right?

Li Qingyou suddenly understood the state of mind of the princes of Zhou Youwang Fenghuo Opera.

Thinking that my brother has grown like this now, I don't know how many wild bees and butterflies will be attracted in a few years, find someone who has no power and power, I definitely can't protect her, and I don't know how much trouble I will cause.

The powerful kind is as deep as the sea......

Li Qingyou was worried when he thought about it.

She has to prepare some dowry for her brother, even if she is old and decrepit in the future, she still has the capital to settle down.

"Sister?" Brother's little hand shook in front of him, and Sister Qingyou had been staring at his face just now, with joy and sorrow on her face, and he felt a little bottomless when he saw it.

Li Qingyou also came back to her senses, and then looked at the brother in front of her who was only eight years old, and she was still early to get married, so she was a little farther away.

Lengthening the handle of the stone mill does save some effort, but it is only some, after all, the yard is so big, and the radius is too long to draw a circle in the yard.

And as Ah Di said, the extra stick is also a burden.

Ah Di is too young and in poor health, Li Qingyou is afraid that he will be tired, so he can only work more by himself, pushing the stone mill and walking for more than ten laps, almost exhausting all his strength, but the soy milk has not yet been grinded out.

Fortunately, the help came......