"Come in and sit down!" Seeing that his wife and Duan Yun were talking politely, Guo Haitao motioned for Duan Yun and Yang Ying to sit down.

Then, Zhao Ru on the side put the tea and pastries on the coffee table.

"Teacher Guo, have you read the email I sent you last time?" Duan Yun asked.

For Duan Yun, he and Guo Haitao are completely people of two eras, and the only common topic is mathematics, so there are too many polite and straight to the point.

Today, Duan Yun has regarded mathematics as a kind of entertainment, and the sense of accomplishment and satisfaction brought to him by successfully solving problems is incomparable to any other entertainment.

So from this point of view, Duan Yun and Guo Haitao are more like a pair of 'chess friends', communicating with each other and burning their brains, and they are also enjoying it, but it is just a fun that ordinary people can't understand at all.

"Look!" Guo Haitao nodded with a smile when he heard this, and then said, "Duan Yun, do you usually like to specialize in cryptography knowledge?"

It's not a specialty, it's just that cryptography is a discipline derived from mathematics, and it has commonalities. Duan Yun raised his eyebrows and replied.

"Hehe, that's right. Guo Haitao smiled, and then asked: "Then the last question I gave you last time, did you check the relevant information from the Internet?" ”

Until now, Guo Haitao still can't believe that Duan Yun can crack the military code of the former Soviet Union in the fifties and sixties, after all, this difficulty is really against the sky, even if it is difficult for mathematicians from many other countries to crack it so easily.

Of course, today's technology is developing rapidly, and the functions of home computers are much more powerful than those decryption instruments in developed countries, but even if Duan Yun just came up with the idea of cracking it, this is a pretty remarkable thing.

"Nope. Duan Yun shook his head and said, "I used my computer to program a few programs, and then cracked that password." ”

"That's amazing. Guo Haitao nodded when he heard this.

At this time, Yang Ying, who was sitting next to Duan Yun, was also surprised when she heard the conversation between the two.

Although Yang Ying didn't know what the two were talking about, judging from the expression on Guo Haitao's face, Duan Yun had obviously done a great thing.

"Bang dang!"

At this moment, there was a sudden crisp sound in the kitchen, as if something had fallen on the floor and shattered.

"Huh?" After hearing this, the three people in the living room suddenly stood up and hurriedly walked to the kitchen.

I saw that Zhao Ru was standing in the kitchen at this time, and the fragments of the porcelain plate on the ground were scattered all over the ground, obviously accidentally broken.

"Xiaoru, what's wrong with you?" After Guo Haitao saw this, he hurriedly asked with concern.

"Ah, it's okay, I accidentally slipped and broke the plate just now. As Zhao Ru spoke, he bent down to pick up the fragments of dishes on the ground.

"Master, take a break, I'll come. Yang Ying immediately bent down and carefully picked up those pieces from the ground, while Duan Yun picked up the broom in the corner of the wall and swept these porcelain fragments aside.

However, when Duan Yun's gaze swept over Zhao Ru's face, his brows suddenly furrowed.

As a god-level Chinese medicine practitioner, Duan Yun could tell from Zhao Ru's face that she seemed to be born with anemia.

Generally speaking, many women who have given birth after marriage will have more or less anemia, but Zhao Ru's anemia is congenital anemia.

Moreover, this congenital anemia will become more and more severe with age, and can only be treated by taking some blood-replenishing* and medications, such as ejiao.

Generally speaking, this condition is not very fatal, but it requires long-term recuperation.

However, Duan Yun faintly felt that as she continued to get older, her anemia symptoms would become more and more serious, and it might even really endanger her life!

For Zhao Ru's symptoms, Duan Yun can give her acupuncture treatment, which can alleviate her anemia symptoms, but at this time, Duan Yun is only a guest here, and he is not a nominal doctor, if Zhao Ru is not particularly serious, it is not suitable for diagnosis and treatment, so he can only give up temporarily.

After all, he would have the opportunity to be a guest at Guo Haitao's house in the future, so Duan Yun could only give up for the time being.

"Either you can rest first. Guo Haitao said to Zhao Ru with concern.

"I'm fine. Zhao Ru replied with a smile and said, "You continue to chat, I will make dinner soon." ”

Seeing this, Duan Yun glanced at Yang Ying beside him.

Yang Ying suddenly understood, and then said to Zhao Ru: "Master, let me help you cook." ”

"No, you really don't need to ......" Zhao Ru was about to refuse, but Yang Ying had already rolled up her sleeves, revealing her two white arms, walked to the pool, picked up a handful of celery, and rinsed it carefully.

When she was 'working' in Duan Yun's supermarket during the previous summer vacation, Yang Ying had already practiced her skills and was quite good at cooking, so it was no problem to help Zhao Ru cook.

There are not many girls who can cook these days, so from this point of view, Yang Ying is indeed a very 'virtuous' girl.

After Zhao Ru picked up a water cup at hand and took a sip of water, her face quickly recovered some blood, and then she also stood with Yang Ying to handle the ingredients, just like a mother and daughter.

Seeing this scene, Guo Haitao's face relaxed.

"Come here. After seeing that Zhao Ru was in good health, Guo Haitao patted Duan Yun's shoulder and led him to his study.

After entering Guo Haitao's study, Duan Yun saw a brand-new computer in the room.

Judging from the speed of the machine startup and the configuration of the display, this should be a top-of-the-line computer, even more advanced than the machine that Duan Yun spent more than 20,000 yuan to assemble!

This may be the only decent household appliance Duan Yun saw at Guo Haitao's house.

After Guo Haitao turned on the computer, all kinds of documents were placed on the desktop, and there were no games or entertainment clients for entertainment.

"Xiao Duan, you said that you used a computer program to crack the password, so can you show me it now?" Guo Haitao said to Duan Yun with a straight face.

"There's no problem with this!" Duan Yun nodded very dryly, and then sat down in front of the computer with his hands on the keyboard.

Duan Yun simply checked Guo Haitao's computer hard disk and found that there were many programming tools in it, and it was obvious that Guo Haitao should also be a master who often used computers.

This is completely understandable, after all, today's mathematical theories are becoming more and more advanced and complex, and the verification of many mathematical theories requires a large number of operations, and even some theories have an astronomical amount of calculations, and no matter how strong the manpower is, it is almost impossible to complete such a large number of operations independently!

So nowadays, it is normal for top mathematicians like Guo Haitao to use a microcomputer to program operations.