Weihang asked everyone else to have a good rest, or go out for a walk, anyway, it's a day off. He himself is at home to help his little sister tutor physics and other science subjects.

Science is the hard flaw of most girls, perhaps it is really the difference in thinking between men and women, mathematics, physics and chemistry has always been a headache for many girls. Hard work is a strong point for girls, which makes them often better in the liberal arts. Wei Lan is no exception, she is seriously biased, and when she is free, Wei Hang can only try to tutor her.

"Didn't you just say that the object moves in a curve, the premise is that the direction of velocity and the direction of force are not on the same line, which is a prerequisite. Wei Hang smiled bitterly.

With such basic knowledge, this girl can't even remember it, and it's always confusing. When confused, he had to let her give an example, for example, the object is in free fall, which is a linear motion, the direction of the force is perpendicular downward, and the direction of velocity is also perpendicular downward, and conversely, when the object is in a curvilinear motion, the two directions are definitely not on the same line.

"There is nothing good to say about these exercise formulas, they must be kept in mind. When the time comes, you can directly apply the formula, as long as the calculation is not wrong, it should not be a problem. Wei Hang took out her information book and pointed out two questions on the spot, let this girl do it and see the effect.

Wei Lan followed the steps taught by her brother, first analyzed the interest of this kind of question, what knowledge points should be used, and then recalled the relevant knowledge, wrote down the formula, put the conditions into the formula one by one, and then calculated.

In this way, both questions were answered without any difference.

"It's not hard to make a good image now. Wei Lan said with a small frown.

"Of course, you just read the formula, and subconsciously think about the knowledge points I just talked about, which is equivalent to giving a small hint, so it is naturally not difficult. This kind of question should be read and done more, and it will be easy to do when you are proficient, and when you see this type of question at a glance in the future, you will immediately think of relevant knowledge. Wei Hang explained.

Almost all people who study are like this, the exam is a mess, this is wrong, that is wrong. But when the teacher explained, he found that it was not difficult, and this is the truth. A lot of things are separated by a layer of paper, and everyone understands when they are pierced.

Also, it's a matter of formulas. Some people may know how to do it, but if they don't remember the formula, everything is in vain.

"Alas, the formula is hard to remember. Wei Lan complained.

"Is that the result of your inner resistance, English words are so difficult to remember, there are so many historical and political materials, you female classmates are not the same as memorizing?" Wei Hang said.

said so on the lips, but in my heart I quite agreed with my little sister's words.

Actually, many people feel this way, both men and women. Although numbers and letters may seem simple, they are easy to mess up when there are too many of them. Many people can memorize the words of a book, but very few can memorize the numbers on a page.

Then, Weihang took the formula out and explained the calculation principle of such a combination. He thinks that as long as the principle is clear, the formula will be easy to remember, and he used to do the same.

Subsequently, we will explain the special and typical curvilinear movements of centrifugal motion, as well as their calculation methods, how to analyze such problems, and so on.

After guarding her for two hours, Wei Hang announced that he would leave class.

"Okay, learn this in the morning, go for a walk and look into the distance, otherwise your eyes are easy to be short-sighted. ”

The human eye can self-focus, and within a certain range, objects near and far can be seen clearly. However, once a person develops the habit of seeing things up close, the eyeball will gradually lose this function.

The retina receives the myopia reflex for a long time, the oculomotor nerve directs the extraocular muscles to continue to relax, and the scleral tissue gradually thins and expands under the long-term mechanical compression of the extraocular muscles, and the elasticity is weakened. The annular fibers of the ciliary muscle continue to tense, the resilience is reduced, and it cannot be relaxed, which becomes myopia.

In this society, there are many people who are short-sighted, and it seems that there is no shame in wearing glasses, anyway, the streets are all over the place, and no one can laugh at anyone. However, it is not always convenient to put a pair of glasses on the nose.

"Finished tutoring, that girl is jumping so much, you should teach her more. Wei Mu saw Wei Hang come out of the house and asked casually.

In the countryside, many parents say that the partial subject is jumping feet, that is, one foot is long and the other is short, which is very appropriate.

"It's not good to sit all the time, I let her rest, otherwise she will be short-sighted, and it will not be good for the lumbar spine. Combine work and rest!" Wei Hang covered for his little sister. Of course, he said this according to reason, and no one can refute it, and this is the cleverness.

Don't sit in one position for a long time, it's better to get up and walk around from time to time. Wei Hang also persuaded his mother, who made dried scallops.

"Xiaoru, you can go play too! Wei's mother asked this prospective daughter-in-law to play, just to want her to spend more time alone with her son and enhance their relationship.

This arrangement is in line with Aunt Xu's wishes, and she hurriedly pushed her daughter to go out with Wei Hang.

Wei Hang and Zhang Xueru hadn't gone far before they heard the two women discussing the matter of finding a day to hold the wedding, Wei Hang almost stumbled and fell, and Zhang Xueru was blushing.

The two walked around the village casually, without falling in love, without saying love, and without holding hands, they casually chatted about interesting things when they were children, and occasionally made small jokes, which was quite pleasant to get along with.

In the eyes of outsiders, they are already talented men and women, and they are very compatible. The villagers who passed by nodded secretly, very optimistic about this pair of men and women, it seems that things are seven or eight points familiar. Some people even ridiculed that when to drink happy wine and the like, Wei Hang was answering euphemistically.

"Sit down for a while!" Wei Hang said, passing under an old tree.

There are two stone tables under the tree, surrounded by several stone benches. They have existed since the defense of the voyage for as long as they can remember, and I don't know when the road began to be placed here. Usually in my free time, there will be some elderly people here listening to the radio, playing cards and chatting.

"Whew!"

He blew hard into one of the stools, blowing the dust off it, and then wiped it clean with a casual wipe.

Although this is not a gentleman's demeanor, let alone a good habit of hygiene, in the eyes of lovers, I am very moved. No matter how simple a girl is, she is eager for romance, longing for her other half to care about herself and sacrifice something for her.

As soon as they sat down, before they could speak, the two navigation birds flew back and landed on the side of Wei Hang, both holding a pearl in their mouths, and they looked good.

They also saw Wei Hang collecting these things at the bottom of the sea, and when they saw it, they took it back by the way.

"It's a pearl. Zhang Xueru's eyes lit up. Women will never be immune to this bejeweled baby.

Wei Hang smiled and nodded, took off the pearl, and patted the navigation bird twice to encourage him. Le's two navigation birds chirped excitedly a few times, and then continued to fly towards the sea.

Wei Hang didn't understand, these animals seemed to like him to touch a few times. He didn't know that when touching those animals, Haizhu could transmit a kind of energy to the animal's body, which was beneficial to all animals, but only some animals with aura could sense it.

"I'll keep it first, I've already found some before, and I'll give it to you after a while when I make a pearl necklace. Wei Hang said. The two navigation birds can also hunt for treasure for him, which is somewhat surprising.

"Hmm!" Zhang Xueru responded in a low voice like a mosquito, and her heart was even sweeter.

At this moment, the phone turned into a big light bulb, singing and dancing.

Wei Hang looked at the number display helplessly, and it was actually Gu Yanji calling, which was a bit surprising. After answering, he was even more surprised that the other party actually came to Tangjia Village and was currently walking to his house.

"Let's go back! Brother Gu is here. ”

"Is that the owner of the restaurant?"

"Well, it's him! I don't know what happened to Lu Dao today. Huang Daquan didn't tell him, aren't we going to sea today?" Wei Hang was a little depressed.

The two rushed back, and they happened to run into Gu Yanji's car. The other party also saw the two of them, parked the car on the road, lowered the window glass, and stuck his head out.

"Brother, get in the car. ”

"Forget it, it's so close, it's just a few steps away. Wei Hang shook his head.

Gu Yanji is not reluctant, driving the car in the back is considered a kind of politeness. It's not good to drive in front and let others eat dust in the back, which is also a kind of social etiquette.

"This is a brother and sister, right?" asked Gu Yanji with a smile.

Seeing a person with an extraordinary temperament coming out of the car, Wei Hang was slightly stunned, and he didn't figure out the identity of the other party, anyway, he had nothing to ask for, no matter how noble the identity of the other party was, it had nothing to do with him, there was no need to cater to him, this is just no desire!

"Zhang Xueru, my girlfriend. Xiaoru, you can also call him Big Brother Gu. By the way, what is this called?" Wei Hang did not deny.

This is the first time he has admitted the relationship between the two in front of outsiders, which made Zhang Xueru very happy and called out Brother Gu crisply.

"Okay! The younger brother and sister are very compatible with the elder brother, when they get married, when the time comes, they will go to the Gu Big Brother Hotel to pack a floor and set up a banquet. This is my good friend Zhao Wenchang, you can call him Brother Zhao, or Lao Zhao, anyway, he is also his age. ”

Zhao Wenchang glared at Gu Yanji, and secretly said Is there such a harm as you? What do you mean that you are at this age anyway? Are you very old? The so-called man has thirty-one flowers! I am in the golden age.

He stretched out his hand: "I will also call you brother! Just call me Brother Zhao, and so are my brothers and sisters, you are welcome." ”

This time, Gu Yanji and they brought some gifts. Two bottles of high-grade national liquor, two good cigarettes, and some cosmetics. Chinese gifts seem to be nothing more than these things.

"I sat inside, and said that you are welcome, I brought so many things. ”

"It's the first time this guy has come! I'm different, the first time I came, the same empty-handed, but I pulled a cart of your baby away. Hmmm! seems a bit unreasonable, next time to make up for it. Gu Yanji pushed these things to Zhao Wenchang in one fell swoop, making Zhao Wenchang roll his eyes.

The list of new books is lagging behind, and the ranking of Sanjiang has also retreated, and the old village is so speechless! I sincerely ask for votes! I solemnly thank the brothers of the grinding hoe for their golden reward, and the first helmsman of our book was born. In addition, there are many brothers and sisters who are enthusiastic about rewarding: Fengshen children, farmer Fan Texi, Meng Erqing, the drunken life of death, ρs ヽ handsome qi ㄣ, mobile 007, Heavenly Demon Emperor 〃 Emperor, Karui Baobao, Xiaodao Lan, Gu Peng. Thank you. Our 16,000 brothers have a collection, and as long as each person has one ticket a day, that's a terrifying number.