Du Lao's mobile phone was never answered, Tang Jianyu dialed the phone in his research room again, and the person who answered the phone was a male student, saying that Du Lao had a class for a while, but the time was not yet up and he could call the office to try it. When Tang Jianyu heard this, he called Professor Du's office again, and the person who answered the phone was an adult woman, who told Tang Jianyu that Professor Du had just gone out to the classroom, "Is there something urgent, do you need me to chase after it?" Tang Jianyu hurriedly said: "No, no, I'll call his mobile phone later." ”

The other party was silent for three or four seconds, and suddenly let out a long "ah" and asked, "Are you Tang Jianyu?" Tang Jianyu was stunned for a moment, while affirming the other party's guess, he quickly recognized this voice in his mind, and after thinking about it for a long time, he still felt very unfamiliar, so he had to ask: "Excuse me, who are you?" The other party smiled heartily: "Your senior sister! Last time Du Lao was hospitalized, you came behind us. There were three of us, remember? "Oh, senior sister, senior sister, I remember!"

After the two exchanged pleasantries for a while, the senior sister held the earpiece and said, "Hey, it's also a chance." Du Lao is about to have a birthday, and this year, it happens that a few students who are usually far away have time, and Zhang Luo wants to do something for him. Today I came to invite his old man. There are no one else, they are all the closest to Du Lao, a group of people who used to learn mathematics. You're his favorite, our little junior brother, you should come along! Tang Jianyu nodded and asked, "Is it his birthday?" "No, maybe a week in advance, maybe next month. You call me and we keep in touch. Tang Jianyu left the phone number as he said.

Tang Jianyu looked at his watch, thinking that the teacher's class would take nearly two hours, so he took advantage of this time to take out the draft of his paper and read it carefully. He is studying for a Ph.D. in education in China, and the direction of his dissertation is the popularization of basic education in remote towns and villages in developed areas. He checked his arguments, writing logic, etc., probably because it was his own article, so he couldn't see the key to being beaten back, so he had to put it down obediently and wait for the master to give advice.

The daylight gradually weakened, Tang Jianyu watched the number of the clock jump to five o'clock, he closed the lesson plan he had just written and got up, ready to go to the nearby vegetable market to have a look, buy some ingredients for dinner, and fill the empty refrigerator by the way. "If the teacher calls, I can't tell you on the street." He thought so, so he didn't bring his phone, picked up the silver-gray tweed coat on the hanger at the door, and went out.

Although the town is located in a remote part of the city, compared to the farming life of the surrounding villages, the residents here are detached from the land and have similar living habits to the people in the city. They are busy with work during the day, and dinner has become the most important meal for the whole family, which also makes the evening market as lively as the morning market, and the variety of goods is not inferior, and you can even find fresh ingredients that did not catch up with the morning market that day.

"Oh, Mr. Tang, it's been a long time since I've seen you come to buy groceries!" The lady of the vegetable stall greeted Tang Jianyu as soon as she saw her, on the one hand, because she was familiar with her face, and on the other hand, she was afraid that he would go to other stalls. Tang Jianyu picked up two potatoes, handed over a radish to him, and the eldest lady said while dialing the small scale, "Today's tomatoes are good, I just got them from the farmers' market in the city at noon, and they are rare in early spring, I see that you love to eat this in summer!" Tang Jianyu picked up the hard red fruits, smelled no fragrance, only the greenhouse crops sold well, but he still picked two and stretched them over, and said: "Auntie's memory is too good, I love tomatoes." Naturally, the stall owner smiled.

Tang Jianyu didn't expect to buy river shrimp in the vegetable market at this time, who knew that there were really familiar aquatic stalls, and it looked like the green shrimp with a long thumb was less than half a catty, but because of the high price, the boss carefully kept it alone in an oxygen supply barrel. As soon as he saw Tang Jianyu's gaze fall on the expensive goods, the stout middle-aged man threw away the half-smoked cigarette, greeted "Mr. Tang", and pulled the black plastic bag to prepare to fish for shrimp. Tang Jianyu shook his head and smiled good-naturedly, and said, "I want this." "Whoa! Thirty-three, give thirty! ”

Tang Jianyu smiled and handed over a fifty, and looked around while the boss was giving change. He squinted his eyes and subconsciously took a closer look, confirming that the middle-aged man in the sauce-colored cotton jacket who was picking dried shiitake mushrooms at the dry goods stall not far away was indeed Lao Liang, the director of academic affairs, and couldn't help but wonder: "Although he has a house in the town, he basically doesn't live here, how can he come to buy vegetables?" At this time, a long-haired woman who looked much younger than Lao Liang took Director Liang's arm and leaned her face on his shoulder, and the two of them looked at a shiitake mushroom, behaving very intimately, and this woman was not the wife of this slightly chubby man.

Tang Jianyu couldn't help but feel nervous when he saw this scene, and quickly turned his face and lowered his head. The fisherman handed over a stack of gross tickets, which were still stained with water for raising fish and shrimp, and said, "Look at the market is about to close, I can't even find five yuan, don't mind!" Tang Jianyu was afraid that he would be discovered by Director Liang, who was walking over, so he hurriedly took a roll of change and stuffed it into his pocket, and detoured out of the vegetable market from the other direction.

Walking out of the gate of the vegetable market, Tang Jianyu's heart was still beating rapidly, Tang's father said that his son was getting older, but he had no experience, which was really true. Tang Jianyu was shocked and a little afraid, if he looked at him like this, the director would definitely not be able to look at himself normally in the future. Just thinking about it, someone suddenly tapped him on the shoulder, "Teacher Tang!" ”

That's unlucky, isn't it? Tang Jianyu couldn't help frowning, closed his eyes, gritted his teeth, turned around and pretended to be relaxed and said to the visitor: "Director, are you also here to buy vegetables?" A small gust of wind blew through the gap between the vegetable market and the cigarette shop next to it, blowing through the two wide-eyed staring people, making a playful whistle-like sound.

"Fishing, fishing boss ......" "It's me, what director, call me confused!" Tang Jianyu couldn't cry or laugh, and said, "What's the matter with you, you don't care about it." The fisherman rolled his eyes, held a black plastic bag in front of Tang Jianyu, and sighed: "You buy shrimp, what about shrimp?" As soon as the smoke slipped, the man was gone, and the shrimp rested on my fish box! These long legs are running fast and chasing me! Tang Jianyu looked at the bag in his hand, and then he suddenly realized, took the bag containing the shrimp, thanked and apologized, and his tone was happy.

It wasn't until after dinner that Du Lao's phone called, and the master and apprentice never had to greet each other and go straight to the point, "I showed your thesis to Lao Tao of Normal University, and he said that your choice of topics is too broad, and the research direction is too institutionalized." Specifically, you can visit it yourself another day. Tang Jianyu said in a sullen voice: "This is also the most direct topic I have encountered over the years!" ”

Du Lao has always liked the simplicity of Tang Jianyu's rigorous personality, and said with a smile: "I know, I know!" You can also put this topic aside, and you can start from your own major and discuss mathematics education! When Tang Jianyu heard this, he had studied mathematics for so long and taught for so long, why had he never thought about this direction? He was immediately overjoyed and said to Professor Du: "A teacher is a teacher, it's a Daigo empowerment!" The old man held the scratch paper on the table and laughed.