"Hello students. Bai Song bowed first, and the classmates immediately fell silent.

It is rare to bow when the teacher comes up, so Bai Song still catches everyone's attention at once.

"I'm a police officer. Bai Song's words were amazing, and the following caused many students to exclaim, after reading so many years, it was the first time that he saw someone come up and actually said that he was a policeman.

"Maybe no one knows me, in fact, I sat down and listened to the last class. Professor Tang may have seen that I didn't pay attention to the lecture in class, no, he called me to the podium..."

Bai Song's cold humor still amused everyone, and the atmosphere was much better.

At this time, some people whispered, and some people knew him! Speaking of which, Bai Song can be regarded as a small blogger, especially the last gold case, which still caused a certain amount of discussion among many chemistry students.

Because of the matter involving hydrofluoric acid corroding the floor slab, even professionals don't dare to play this in practice, and as a result, there were so many follow-ups, which is really an interesting case.

This came and went, everyone passed on to each other, and many people knew that Bai Song was indeed a police officer in Tianhua City, and he was also a criminal policeman, which caused a lot of gossip.

Maybe it's because of the poison of TV dramas, many people default to the fact that the special police are better than the criminal police, and the criminal police are better than the police... In fact, all police officers are called people's police. So as soon as everyone mentioned that this was a criminal policeman, they immediately became more interested.

Before this began, there was a good classroom effect, which Bai Song did not expect, and the nervous feeling that came up just now was basically gone.

Bai Song put his hands twenty centimeters in front of his stomach, spread his hands upward, signaled a little quieter, and then said, "Today, let's talk about chemistry in life. ”

Even though everyone is a high-achieving student, Bai Song has prepared for a week's class, and there are still a lot of things to talk about, especially for plastic surgery, beauty and medicine, which has indeed aroused a lot of interest.

Twenty minutes into the class, Bai Song's cell phone rang.

Because of work, Bai Song never muted his mobile phone, Bai Song took it out and took a look, it was Liu Shuyuan's, he didn't know what the big deal was, so he could only apologize to his classmates, turn off the microphone, and answer the phone.

"What's the matter?" Bai Song's expression was a little serious.

"Today is cloudy, our side sent someone to the hospital, but the 13th floor is not open. Liu Shuyuan said.

"It's okay, it's normal for it to be cloudy and not open. Bai Song lowered his voice, covered his mouth, and said.

"Could it be because we startled the snake?" Liu Shuyuan was a little worried.

"No, if we had scared the snakes, they wouldn't have let the truck out yesterday so soon after we came out. Bai Song said: "On a cloudy day, if the lights on the thirteenth floor are too bright, it will be easy to find outside." ”

"That's good", Liu Shuyuan exhaled lightly: "By the way, what are you doing? Why is the voice so small?"

"Let's not talk about that, I'm lecturing. "White Pine returned to its normal volume.

"Lecture, oh oh oh, you said yesterday..."

"Well, that's it, I'll talk about other developments in the case. ”

After Bai Song finished speaking, he hung up Liu Shuyuan's phone.

...

"The little brother of the police looks so handsome when he is serious..."

"yes, I suddenly changed my face, and I'm really handsome..."

...

Although Bai Song didn't turn on the microphone, the words he said at a normal volume could still be heard in the first few rows, and he generally knew that Bai Song had temporarily arranged a case, which aroused everyone's gossip.

And his ear power is good, as soon as he calms down, he can basically hear everything talking below, and now listening to the conversation below, he can't help but blush a little.

Bang bang bang...

Someone applauded.

Bai Song looked at it, who else was it not Wang Huadong?

Applause is contagious, and everyone applauded and coaxed one after another, asking Bai Song to talk about the case.

"I'm sorry, but this case is confidential. Bai Song apologized to everyone, "Let's continue to talk about the topic just now." ”

Talking about these, Bai Song is still very comfortable, maybe everyone is of high quality and does not embarrass him, so he can also answer a few questions, and the classroom atmosphere gradually recovers.

When talking about a drug for subcutaneous injection, Bai Song was suddenly stunned for a moment as he spoke, and he was still a little unskilled, so he had to flip through his notebook and continue to talk about it.

Lao Tang asked Bai Song to speak for an hour, and Bai Song planned to speak for 45 minutes, but he went back and forth for 50 minutes, and the effect was not bad.

Bai Song even saw a few people taking notes, which really made him feel a sense of accomplishment.

"Thank you for listening to my communication, chemistry is a magic trick, I hope that in the future, everyone can use the magic wand in their hands and become talents in various fields, thank you." Bowing again, Shiratsu stepped down from the podium.

Hearing the applause again, Bai Song made a gesture of invitation to Ding Jianguo and handed the podium to her.

As a result, as soon as the young lady stood up, the applause of the whole class thundered. Before people go to the podium, the effect is countless times better than that of white pine!

Moreover, the man in the first row of teaching assistants almost broke his hands!

Bai Song originally wanted to express a little gratitude for Wang Huadong's failure, but he was speechless when he saw this.

This is the brother?

Ding Jianguo's voice is very infectious, and today I am not talking about some esoteric chemistry courses, but about some experience in graduation thesis writing and experiments for the master's level chemistry researchers here.

This is really useful knowledge, and everyone here, as long as they have not graduated with a PhD, is facing this problem. And the one who lectured above, it is said that his doctoral dissertation has also been published in internationally renowned journals, and SCI and the like have been soft.

But this is of little use to Bai Song, and he will definitely not be able to study these professional knowledge.

Manpower is sometimes exhausted, and even Einstein has many places that are inferior to ordinary people.

For example... His Chinese is not as good as anyone sitting there!

Wang Huadong turned Bai Song, wrote a few words in the notebook, and handed it to Bai Song.

"I see you were stunned for a moment when you were lecturing just now, is there something wrong?"

He still knows Bai Song very well, every time Bai Song is stunned, it is often the brain circuit that is connected to something, and this can often lead to the cracking of a certain case.

"When did you become so observant?" Bai Song took a pen and wrote it in his notebook.

"Don't forget what I do. Wang Huadong then wrote: "What is it, is it convenient to say?"

"There's no rush. Bai Song wrote: "I have an idea that needs to be verified, and if it is true, then there should be an opportunity to solve this case." ”