As a student, it always takes a while to get used to it after a vacation. The specific manifestation is that I don't want to get up in the morning, I don't want to listen to lectures in class, and I don't want to study on my own at night.

Seeing that Professor Zhang, who was wearing black-framed glasses and gray hair on the podium, was giving a lecture with a river of mouth, Lu Tao only felt groggy and wanted to sleep when he lay on the table.

It's not that he doesn't want to learn, and it's not because he came back from vacation, but because this Professor Zhang is a well-known lecture in the entire college.

If you really want to use a very vivid sentence to describe Professor Zhang's lecture on the podium, Lu Tao can only think of the sentence "A book at the beginning, and the lecture depends on reading".

Lu Tao can still bear to read according to the textbook, but what does it mean to teach a dialect?

Professor Zhang didn't care about the large number of sleepy students below, or rather, he didn't have a good way to do it.

I lifted the glasses on the bridge of my nose, opened the textbook, looked at it twice, then turned my head to take the chalk and wrote down what I was going to read today's on the blackboard.

After writing a few big characters, Professor Zhang turned his head, first looked at the students below, and then cleared his throat: "Tongxiao, with the sky, we are going to talk about the first law of leaf mechanics." “

Li Hong is a good boy, and he basically has no part in skipping class, and he is a little funny at this time, he tilted his head to look at Lu Tao who was lying next to him, poked his left hand, and then opened his mouth to learn Professor Zhang's accent.

Lu Tao raised his head, lowered his voice and said seriously: "Listen to the class." ”

Professor Zhang teaches physical chemistry, which is the most difficult subject in chemistry, but in fact, for Lu Tao's future work, as long as he is not admitted to graduate school, he is basically not needed.

So at this time, he didn't have much of the heart to listen to the lecture, and he talked nonsense with Li Hong next to him.

"Listen, it's not all read from the textbook. Li Hong looked at Professor Zhang in the stands a little helplessly.

What Li Hong said was indeed true, and Lu Tao couldn't refute it: "This is only the first class, bear with it." “

"That classmate, get up and talk about it. Perhaps it was because the two of them were disturbed by their words, or maybe Professor Zhang, who had never cared about what his classmates did in class, wanted to show his authority. In short, Professor Zhang named him for the first time.

A university teacher usually has several classes, and there are only a few classes a week, and if you are not the class teacher, you sometimes don't even know the names of the students.

With a bang, all the students in the two classes turned their heads and looked in the direction of Professor Zhang's finger.

Li Hong pointed to his nose and was a little puzzled: "Call me?"

"The one next to it. Perhaps tired of reading, Professor Zhang took off his glasses directly and walked around the podium leisurely.

Lu Tao was a little helpless, so he said a few words to Li Hong, how could he catch himself, it was really unlucky.

"Teacher Zhang, what are you talking about?" Li Hong next to him was sitting and laughing stupidly, Lu Tao stood up and looked at Professor Zhang, his face was not embarrassed at all, and asked directly.

"Seeing that the classmate next to you just now is talking energetically, you can talk about the relationship between enthalpy and entropy. “

Lu Tao directly opened the textbook and read it up: "Entropy change refers to the change in the degree of chaos in the system, and the change of entropy to a positive value indicates that the degree of chaos in the system increases. △H is the enthalpy change, △S is the entropy change, △G is the free energy of the system, and t is the temperature. ”

"Yes. Professor Zhang nodded, seeming satisfied. Lu Tao breathed a sigh of relief, what is there to talk about, just like the teacher, read it again, I didn't expect it to be so easy.

After finishing speaking, Lu Tao sat down, and how did he know that Professor Zhang asked again: "Then what is the difference between the two?"

Lu Tao couldn't help but be dumbfounded, he had done chemical analysis for so many years, what he was good at was instruments and experiments, and he had long forgotten about these conceptual things.

"Learning, you can't know half of it, you must know what it is, and why it is. If you see it, don't be like this classmate, who only knows the concept and doesn't know the specific application. Seeing that Lu Tao couldn't answer, Professor Zhang couldn't help but start preaching.

Lu Tao almost came out of an Internet beast in his heart: You have already talked about it, I will talk about it, I read it according to the textbook, and it is strange that the students can understand it.

Of course, there is nothing to say about Professor Zhang's academic and scientific research ability, but the problem is that he has a belly of knowledge, but in the teaching part, it is really a little flattering, otherwise Lu Tao would not have such an evaluation.

Before Professor Zhang could say anything, Lu Tao said directly: "Enthalpy is to describe the energy state of the system, and entropy is to describe the chaos of the particles of the system." ”

If it weren't for the wit just now, I really couldn't answer it. This kind of very professional course is actually more difficult, but fortunately, he has already learned it in his previous life, and many things are in the subconscious. Just one glance at it will make you understand what it means. If you haven't learned it at all, it's easy to confuse people just by looking at the meaning.

Professor Zhang opened his mouth slightly, stopped pacing, and coughed: "Well, yes, classmates, the preview is very important, you look at this classmate, I haven't even said that he has already previewed, very good, everyone must learn from him, otherwise it will be a matter of swallowing dates, and do not seek to understand." ”

Preview, a ghost, preview, Lu Tao rolled his eyes.

I really don't feel like this course, I think it's better to slip away as soon as possible, and those labs should also start doing experiments at this point, and it's better to make money.

As soon as Bu sat down, Li Hong leaned his head over again: "Lu Tao, it's okay, you still have a preview for the winter vacation?"

Lu Tao was cheated by him once, and said directly: "You will suffer yourself in the next class, I have to run first, if you call the name, you have to answer." “

When the first class ended, Lu Tao walked directly with the textbook, and before he reached the door, he was seen by Professor Zhang.

"Classmate, what's your name? Professor Zhang had a smile on his face.

"Lu Tao. Lu Tao, who wanted to slip away with the textbook, was a little embarrassed.

What's going on, I was just about to skip class, and you came to praise me for speaking well, why am I embarrassed to skip class?

"Oh, you're Lu Tao?" Professor Zhang looked at him, a little surprised.

Lu Tao looked at Professor Zhang in front of him and found a problem, it seemed that this scene was very familiar.

That's right, it's the "what's your name" chemistry professor in Weilong, who skips school.

"Professor Yu told me about you two days ago, I heard that you know a little bit about instruments?" Professor Zhang, who didn't notice Lu Tao's expression, continued to ask.

At this time, of course, it is necessary to appear professional, since Mr. Zhang in front of him was introduced by Professor Yu, it means that it is likely to be a problem with the instrument.

Therefore, Lu Tao replied directly: "Yes".

Without the slightest hesitation, it's important for a salesperson to be observant, but confidence is just as important.

From Professor Zhang's eyes and questions, there was an intuition telling him that something good was likely to come.