In the library of City A, a young girl with headphones is watching a video by the window, next to the messy scratch paper and all kinds of books, and scratching her head from time to time.

Jiang Yue couldn't understand what was said after listening to the video class, so she went back and asked my sister what this meant.

"Strange, why is this strange girl in the library?" Wei Feng looked at the girl in front of him, and quietly sat down next to her, looking at her class. Jiang Yue was so focused on studying that she didn't notice anyone approaching at all.

"The law of refraction of light says that light is deflected from one medium to another, you see, because the actual position of the refractive fish is a little bit below, what the eye sees is actually a virtual image of light propagating in a straight line without deflection, a little bit above, and the dotted line is drawn like this......" Wei Feng lowered his voice and lectured to her.

Jiang Yue listened attentively to Wei Feng's explanation, and it was really much clearer to hear him say this.

"You're pretty good, thank you. Jiang Yue lowered her voice and thanked him, thinking of something that she couldn't figure out for a long time, so it would be clear at once.

"That's, your dad is still your dad. Wei Feng was a little carried away when he saw this strange girl boasting about herself for the first time.

"I find that your mouth is really owed. Jiang Yue, who was originally grateful, couldn't help but want to beat him when she heard Wei Feng's ridicule.

"Then do you want me to teach you?"

Jiang Yue turned her head, and then fought with the textbook, "Don't." ”

"Why," Wei Feng leaned on the table to look at her.

"You can only teach me for a while, and after a while I will go back, and I still have to rely on myself to learn. "Jiang Yue didn't want anyone to help.

Wei Feng wanted to say something, Jiang Yue put down the pen, turned her head to interrupt him, and said proudly: "Besides, I still have my sister." ”

"Okay, good, your sister is amazing, a brave girl who fights lone wolves. I found out that you have strange power genes at home, why are you so combative?" Wei Feng was really surprised, she was usually a cute girl who looked petite and cute, how could she be so powerful in the wild.

"That's because you're too weak to even be afraid of spiders. ”

Wei Feng was terrified when he thought of the experience in the mountains, and all kinds of birds and animals were about to scare out of heart disease. "Okay, okay, don't talk about that. ”

"Why did you get here?" Wei Feng is such a hip-hop person, and he doesn't fit in with this quiet library at all.

"The library wanted to update their database, and I was here to guide them. Wei Feng looked at Jiang Yue with a look of begging for praise.

Jiang Yue couldn't help but laugh when she saw his funny appearance, and said very exaggeratedly: "Wow, you are so amazing." ”

"Okay, okay, are you praising me or hurting me," Wei Feng waved his hand, "You study first, I'll take you to eat delicious food later, and I haven't thanked you for helping me in the mountains." ”

"No, my sister told me to go home for dinner. "Jiang Yue is not very suitable for Wei Feng's self-familiar character, she has always been alone.

"Don't push it, your sister and I'll tell her. After Wei Feng finished speaking, he hurriedly ran away, not giving Jiang Yue a chance to refuse.

You can't make a loud noise in the library, Jiang Yue didn't stop Wei Feng, and she agreed to his appointment to eat, see what this old man wants to do.