Back at school from Martin's house, it was almost dinner time. Both roommates are gone, and the dormitory looks deserted. Chen Ying took cold medicine and browsed the campus BBS on the Internet for a while. Many people have gone home, and the campus forums that were once active are very lonely. She searched and searched, only to find a student job who could only be a dormitory administrator at the beginning of the next semester. She was thinking about whether to go to an off-campus convenience store to work as a temporary clerk for a month when the dormitory phone suddenly rang.

"Hey, is it Chen Ying? Have you eaten? Liang Jing's voice came from the phone.

"Well, it's me. I haven't eaten it yet. ”

"That's best, I'm still in the lab, let's come over and have dinner together."

"Still going to the lab on vacation?" Chen Ying was a little surprised.

"The Department of Psychology is the Department of Experiments, and every day there are endless experiments and endless reports. I'm not going to talk to you anymore, I'm waiting for you in that lab on the second floor, come here. ”

The phone hung up, and Chen Ying shook her head with a smile. She touched the inside pocket of her coat before going out to make sure her meal was there. She picked up a bag of trash in the corner of the room and went out sideways to lock the door. Before leaving the building, she threw the garbage into the half-filled garbage basket and roughly flushed it in the water room next to her. Then put on gloves and step onto the snow-covered campus corridors. In winter, it gets dark early, and the dim lights are already on, and everywhere is bright against the white snow. Chen Ying walked briskly and came to the familiar outside of the two-story building. In front of the building, only gray-brown branches remain, and a thick layer of snow was pressed on them. The wisteria flowers scattered on the ground were gone, replaced by a white sheet of snow without footprints, shimmering like stars in the light of the street lamps.

Chen Ying pressed the number, and the access control sang a familiar song. Liang Jing soon appeared at the door.

"It's coming so fast." Liang Jing said and led Chen Ying to the second floor, walking in the opposite direction of the usual volunteers doing psychological tests. Before entering the laboratory, she took off a white lab coat from the coat hook on the wall at the door and compared it to Chen Ying.

"You have to wear a lab coat when you enter the lab." Liang Jing said and handed the coat to Chen Ying, "Even if you don't come here to do experiments, you have to do that." ”

"It's so strict." Chen Ying admired. She took off her coat, hung it on the empty coat hook, followed Liang Jing's example and fastened the front row of the white coat, and took a small clip to close the collar.

"Coming?" The door opened, and the math boy who was working as a teaching assistant with them poked his head out. He also wore a white coat, black-rimmed glasses, and a string of black beads on his left wrist. Chen Ying couldn't help but look at Liang Jing.

"Hmm-Ye Feng is here to observe." Liang Jing casually explained, "He may take a course in the Department of Psychology next semester. ”

"Isn't he already doing a double major in philosophy?" Chen Ying asked in a low voice.

"Well, yes. But he became interested in psychology again and asked me a few times after the final exam. These days, I came every day to learn how to do experiments. Liang Jing whispered and walked back to the test bench covered with black fire mats, raised a small beaker, and looked at the light to see if the liquid inside was uniform in color.

Chen Ying did not speak. She sat on a square stool and watched with interest as Liang Jing picked up the small glass rod and stirred and stirred the reagents in the beaker.

"Ye Feng, can you help buy a bottle of water?" After a few minutes, Liang Jing said without looking back, "I'm a little thirsty." ”

"Okay." The math boys quickly went out.

"So you called me to dinner, but you actually wanted to tell me about it?" Chen Ying said and walked to the place where Ye Feng was sitting just now, picked up a copy of "Real Variable Function" that had just been placed on the windowsill, she flipped through it casually, closed the book and placed it next to the two pots of succulents. The temperature in the lab was very high, and these two potted plants were growing very strongly.

"I need to pour this potassium permanganate into the burette now – not a drop can be missed." As if she hadn't heard Chen Ying, Liang Jing carefully removed a slender glass tube that was originally stuck on the iron frame. The tube was nearly a meter long, and the body of the tube had a scale marked with a white line. Liang Jing lifted the tube to eye level and let the liquid flow down the inner wall of the tube until the lowest part of the liquid surface was exactly tangent to the engraved line.

"Looks like you're not going to tell me." Chen Yingping said calmly.

"I'll talk about this later, you wait for me to set up the burette first." Liang Jing said and began to look for the clips on the iron frame, and clamped the burette with a rubber clip little by little, trying not to let the liquid in the tube shake back and forth during the whole process. It took her a long time to finally clamp the next clip. Then she knelt on one knee on the square stool, ready to secure the upper part of the tube.

"I'm back." Ye Feng opened the door with four bottles of water. Liang Jing glanced back at him, probably because the clamp below was not firm enough, and the long burette was crooked, falling from the iron frame, and smashed on Liang Jing's shoulder, all the liquid in it flowed out, staining the back of her white coat red.

"Why don't you wear a lab coat?" Liang Jing held the burette in one hand and looked at Ye Feng angrily and said.

"I—forgot." Ye Feng retreated with a face full of shame.

"This is already the fourth." Liang Jing put the burette into the pool with regret, and Chen Ying saw that there were already several glassware of the same size lying inside, and there were two slender brushes soaked in the bottom of the pool.

"Looks like we won't be able to finish this experiment today." Liang Jing said as she turned on the distilled water and began to wash the instrument. Chen Ying was next to her and helped her press the water-saving valve.

"This experiment is very difficult to do, and the test solution must be filled with a dry test tube, which needs to be very accurate, otherwise the results will not be accurate. Moreover, the surface tension of the liquid should also be taken into account, otherwise it is easy to overdose. I've been trying all afternoon and so far without success. Liang Jing said, carefully placing the instrument on the clamp and waiting for it to dry. She took off her rubber gloves and tucked them into her lab coat pocket. found a square stool to sit with Chen Ying.