In this question, the electrolysis process of hydrogen ions in the cathode to get electrons, is a reduction reaction, and this destroys the ionization of water, the concentration of hydroxide ions increases, the pH value increases, so the answer is obtained. ”

At this time, it was noon, and Bai Yun was explaining chemistry problems to Huangye Temple.

"......I see," said Huangye Temple, "he is worthy of being the representative of the chemistry class, at least in chemistry, he is quite reliable." ”

"Hey, what does 'at least' mean, isn't my other subject reliable?" Bai Yun smiled awkwardly.

"Yes...... After that, I will also ask you for English questions. "Huangye Temple said coldly.

"Just kidding, just kidding!" Bai Yun said, "I have to ask you for English questions, no matter how good I learn chemistry, how can you learn English so well?"

"What's the use, what's the use of learning well now? Maybe you'll learn another language in college, and you'll forget almost all of your English. Huang Ye Temple said, "It's you, you will definitely go to college to study chemistry-related majors, right?"

"I said you saw too far, didn't you!" you haven't even finished half of your sophomore year of high school," Bai Yun said, "but...... Well, I studied chemistry best, and there seems to be nothing wrong with majoring in chemistry in college. ”

"Xiaobai, let me ask you a question, how old do you think I am now?"

Bai Yunden was stunned for a moment, he looked at the Yellow Leaf Temple and thought about it, and then said: "I remember that you are on December 9th, and it is almost there, I think it should be ten ...... Seventeen, right?"

"I actually remember my birthday so well?" said Huangye Temple Qi, "However, there has always been a strange feeling lately......"

"Strange feeling?" Bai Yunqi said, "Do you feel that something is wrong with your body?"

"Maybe it's my delusion," said Huangye Temple, "I feel like I'm in my thirties......"

Bai Yun was so startled that he almost cried out, but he still managed to suppress his surprise. But soon he felt that his brain was in a mess, and he secretly said, "What's the matter?" I thought he was remembering the things in that world, but we have been in that world for four years, which means that he ...... We're actually all twenty to twenty-one years old, but what the hell is a thirties?"

"You may not believe it, but I had a long, long dream when I was in a coma, and I still remember everything in the dream......" Huang Ye Temple said, his hands starting to tremble.

"You mean...... Prophetic dreams?" Bai Yun asked.

"I don't know, but it's a very long dream......" Huang Ye Temple said, lowered his head and propped his head with his hands, "I remember that it was in a classroom at a military academy at first, and I was already in my senior year......

"Senior year?" Bai Yun said darkly, "If you want to talk about prophetic dreams, it's a bit far away......"

"If it were you, I would have thought it would be inexplicable, wouldn't it? Why is it that you're still in high school, so why are you suddenly in your senior year......?" I entered the military academy because I was not firm in my will when I filled in the volunteers, and I passed by the first division. ”

"That is, although it is the starting point of the dream, you have the memories before this starting point?" Bai Yun said while thinking, "Maybe the mind will quickly make up sporadic memories, but such detailed memories should not be made up by the brain." And then what?"

"I learned that day that I didn't pass the graduate school entrance examination, and I didn't go back to Beijing when I graduated, so I worked in other places for five years...... I was in a lot of pain in that place, so I went to Beijing Normal University for graduate school without the consent of the organization, but I failed the exam...... It was really a very painful five years, and I really felt that time passed day by day, minute by minute, and I could still call the names of the people I met in my dreams...... Do you think ordinary dreams are so informative?"

"This ......" Bai Yun couldn't help but gasp, "It's really not an ordinary dream......

"But that's not all. In my dream, someone told me that I could go back in time and change history...... I did what he did, and I really went back to the day of the college entrance examination, so I tried my best to make the military examination fail, and then I was admitted to the first normal university as I wished......"

"This ...... Wouldn't it be great?"

"But my mother was shipwrecked the day before my undergraduate graduation ceremony...... I went to graduate school and then to a PhD, but I spent all of my time in a world without her......"

At this time, Bai Yun couldn't help but think of a movie he watched before he went to high school, "The Butterfly Effect", and he said in his heart: "A person's happiness is conserved, and by changing history, it will lead to the loss of the happiness he already has...... Is that what it looks like?"

"But I wasn't willing to sacrifice my loved ones for the realization of my dreams, so I turned back the clock...... But this time, I came to a world that was close to the end of the world, and I met you in that world......"

"Me?"

"Hmm...... You say that I should have borne a huge price for changing history, but you did everything you could to bear the price, and then you ......"

Huang Ye Temple began to choke up as he spoke, and he didn't say the words again, but this was enough for Bai Yun to guess the ending.

"Little White ......," Huang Yesi continued to say in a low voice, "After the first semester of your third year of high school, will you leave us and transfer to Chongqing to study?"

Bai Yun was stunned and said, "You even know about this?"

"I knew it in my dreams, the moment I met you...... No, I should say that I remembered. ”

"I don't want to do this either, but I can't ......help it," Bai Yun said and lowered his head, "Because I don't have a hukou in Beijing, I have to go back to my hometown when I take ......the college entrance examination."

"Yes, that's really the case......" Huangye Temple said with a little frustration, "We can't even graduate together......"

"Don't ...... Don't talk about discouragement! Maybe some new policy will be introduced at that time?" Bai Yun suddenly stood up and said, "If it really doesn't work, we can just go to the same university at that time! If you want to go to the first normal university, I can go there too!"

Huang Ye Si was stunned for a moment, he looked at Bai Yun's serious face, and then couldn't help laughing, and said, "What are you kidding? Why do you have to go to the same school with me? We are not boyfriend and girlfriend! Could it be that you want to be a teacher like me? But ...... Well, your serious look does look a bit like a teacher......"

Bai Yun was a little embarrassed by the Yellow Leaf Temple's ridicule, and said, "I'm not joking! Don't laugh! Don't you want me to do this in your heart?"

"Nonsense, how can there be ......"

"If you encounter those things again in the future, who will stand up for you!"

Hearing Bai Yun's words, Huangye Temple's expression gradually became serious again.

"I want to protect you, even if I sacrifice myself, and I don't want to see you hurt......"

"Yes......" Huangye Temple turned his face and said coldly, "Then you better do what you can, you can't protect me for the rest of my life......"

The blue sky outside the window was obscured by dark clouds at some point, and the classroom, which had been bright just a moment ago, became dim.