Xiao Yiheng first told Youyou how Archimedes discovered the principle of buoyancy while taking a bath, and this principle is actually the same as that of Cao Chong's weighing of elephants.
Youyou had never heard of Archimedes, but Cao Chong claimed that she still knew it! "Cao Chong Calls the Elephant" is a compulsory subject in elementary school textbooks, but the language class focuses on Cao Chong's wisdom and wisdom, while Xiao Yiheng talks about the physical principles.
Youyou didn't know until today that Cao Chong started to study physics at such a young age, and the little friends in ancient times were too pitiful.
"In short, the buoyant force on an object is equal to its own gravity." Xiao Yiheng dipped his finger in the water and drew a simple sketch on the shore.
He drew the pool, drew the stickman grapefruit, and then drew a vertical upward arrow on the stickman's stomach.
And this is the force analysis diagram of Youyou when swimming.
Youyou seemed to understand but didn't understand: "Brother Xiao, what do you mean, when I was swimming, an invisible hook lifted me up?"
Xiao Yiheng: "...It's not a hook, it's buoyancy."
"Does the elephant also have this hook on it?"
"..." Xiao Yiheng was defeated, "Yes."
"Then why the hook didn't lift the elephant, but it lifted me."
"Because elephants are denser than water."
"Density? What is density?"
How does a ten-year-old friend know about density and buoyancy? Xiao Yiheng explained it for a long time. The more you listened, the more confused you became.
Youyou is tired and doesn't want to fight anymore.
"Brother Xiao, I really don't understand what you're talking about." Youyou hugged the neck of the flamingo pontoon and said aggrievedly, "I can't see the hook either."
Xiao Yiheng explained with great effort: "that hook - I mean buoyancy - is not visible to the naked eye, it is for you to feel."
"But I can't feel it!"
Li Cheng was on the sidelines for about ten minutes, seeing that Xiao Yiheng was drawing force analysis diagrams and talking about density formulas. He was busy for most of the day, but his progress was negative. Looking at Yuyou again, her two big eyes were covered with two balls of tears, even more pitiful than the little daylily in the field.
After all, Youyou is only ten years old, so multiplication and division is not easy. The force analysis diagram that Li Cheng can't understand, Xiao Yiheng still wants Yuyou to understand.
Li Cheng's brain smoked when he heard it, and he couldn't stand it. He jumped into the water and walked quickly to Xiao Yiheng's side, letting Alpha let the brothers and sisters go, and stop reciting those annoying formulas: "There are so many messy things in swimming, do I have to do it before every time I paddle? Have you calculated the buoyancy formula in your mind? Swimming is an instinct, you talk so much, do you know how to swim?"
Xiao Yiheng was unexpectedly silent for a long time.
Li Orange: ! ! !
Li Cheng was shocked: "woc, you don't really know how to swim, do you?"
He originally thought that Xiao Yiheng was the king, but he never thought that Xiao Yiheng was inferior to bronze.
Xiao Yiheng eloquently said: "A good gourmet may not necessarily be able to cook; a good film critic may not necessarily be able to make movies..."
"—But a good swimming coach will definitely know how to swim!" Li Cheng interrupted his sophistry, "Okay Xiao Yiheng, please stand beside Youyou! My brother Li doesn't believe in this evil, it's just swimming. Well, I will definitely teach you both today!"
So Li Cheng changed from teaching one person to teaching two people.
No, not people, but two pigs.
That's not right, pigs are so cute and they are born to swim, how could he insult the cute little pigs with these two dumb elm heads
Li Cheng once thought that a scholar like Xiao Yiheng must be proficient in everything. In addition to being able to draw and solve problems, he should be good at various sports, such as swimming, how could Xiao Yiheng not be good at it? Will it be
Xiao Yiheng smiled bitterly: "Remind me, there is no causal relationship between 'I am a scholar' and 'I can swim'."
Li Cheng bared his little tiger teeth fiercely: "Then what can constitute a causal relationship? Can there be a causal relationship between 'You can't learn to swim' and 'I'm going to be fooled by you'?"
"… "
Li Cheng put his hands on his hips, looked at the two landlubbers in front of him, and issued an order with a serious face.
"I'll count one, two, three." Li Cheng said, "Dive down together, hold your breath. Be careful, don't squat down straight, bend your legs slightly, bend over and bury your head in the water. You must relax your body, Especially relax your waist and abs, and feel that something is holding your lower body up to the water. As long as your hips float up, your legs will naturally float up!"
"That's not 'something'," Xiao Yiheng corrected, "that's 'buoyancy'."
"That's not 'something'," Yuyou imitated, "that's 'little hook'."
Li Cheng said stubbornly: "It doesn't matter what it is, in short, you have to hold your breath underwater for a minute... Forget it, hold your breath for 30 seconds first."
"Thirty seconds is a long time." Youyou said nervously, "What if I choke on water."
Li Cheng comforted her: "Don't worry, my brother is here to watch over you, and my eyes will never leave you. And I have done lifeguard training. If you are really choking, my brother will give you artificial respiration."
When he heard "artificial respiration", little adult Youyou seemed to cover his mouth and said in disgust, "Hey, that's fine!"
Li Cheng: "..." Is there any reason for being an elder brother to be disliked by his younger sister
Under the intimidation of Li Cheng's iron face, the two beginner swimmers stood up, held their breath, lowered their heads and plunged into the water.
Li Cheng counted for them, one, two, three...
I don't know if it was because Xiao Yiheng accompanied Yuyou this time. Under the water, the little girl's body gradually relaxed, her waist gradually floated up, and her hips, legs, and feet went up one by one, and her whole body was supported by the water. Get up!
Her limbs were wide open, her eyes were tightly closed underwater, and she was dragged to the surface by the invisible "little hook".
It wasn't until the oxygen in her lungs disappeared that she broke down and emerged from the water with a pop, her face flushed with excitement.
"Brother, did you see it!" Youyou danced, "I learned to swim!"
Li Cheng tapped her head: "You just learned to float, but you haven't learned to swim yet. Well, you go to the shore to rest for a while, and then come down to continue practicing."
After practicing for so long, Youyou was already tired. She got her brother's pardon and jumped ashore immediately. There is a vending machine on the shore. Youyou put in a coin and exchanged a bottle of cool and happy lemon tea.
When Yuyou was free to relax, Li Cheng frowned and stared at Xiao Yiheng's shadow under the water, his expression became more and more serious.
It's been a minute, Xiao Yiheng's figure is still underwater, not floating or relaxing, like a heavy stone.
Is his lung capacity so strong that it is not exhausted now
Li Cheng was worried that Xiao Yiheng was showing off his power, so he quickly walked to his side and stretched out his hand to pull him out of the water.
Unexpectedly, before Li Cheng's hand stretched out, his waist tightened - Xiao Yiheng, who was underwater, actually hugged his waist and pulled him into the water with all his strength!
"Fuck, how dare you sneak attack! Gulugulugulu..." Li Cheng was caught off guard, and the unspoken swear words all turned into a series of bubbles.
The shallow water area was only one meter two, and when Li Cheng stood up straight, the water overflowed his waist. Because of his professional training, Li Cheng did not panic after entering the water, but immediately opened his eyes, twisted his body at the fastest speed, aimed at Xiao Yiheng's shoulder and kicked it - this bastard dared to sneak attack on him in the water. Dragon King, who gave him courage
If you don't give Xiao Yiheng some color today, then Brother Li might as well take his surname!
Unexpectedly, in the face of Li Cheng's kick, Xiao Yiheng did not dodge, but directly greeted him, grabbed Li Cheng's ankle with a big hand, and pulled the omega towards him domineeringly.
Shui Liu became alpha's most powerful assistant. Li Cheng's body lightened, and he was actually dragged in front of Xiao Yiheng.
Li Cheng widened his eyes in surprise, opened his lips unconsciously, and flashed the tip of his bright red tongue between the two rows of white teeth.
- The next second, Xiao Yiheng kissed him.
The four lips met, the air in his mouth was taken away, and he was sent back lingeringly.
Underwater light and shadow are separated, and the clear and mysterious blue surrounds the two teenagers. As the water waves rise and fall again and again, those chaotic rays of light are divided into countless fragments.
Li Cheng stared blankly at the alpha who was close at hand. Between the messy light and the blue water waves, Xiao Yiheng's handsome face was a little distorted.
Xiao Yiheng's eyelashes closed lightly, and the water flow gently brushed the corners of his eyes and brows. He is no longer a cold iceberg, he has already been melted by Li Cheng.
No one knew that in this seemingly peaceful pool, there was a passionate kiss hidden beneath the water's surface.
…
Yuyou sat on the bank with her cheeks on her back, with a straw of Happy Lemon Tea in her mouth, and looked at the two people in the pool suspiciously.
"Brother Xiao, what happened to my brother?" she asked ignorantly.
Just now, brother Xiao was holding his breath while practicing underwater, and his brother suddenly dived into the water, and then saw the waves churning and gradually calmed down - and then, the two of them emerged from the water at the same time!
Li Cheng's face was flushed, and his mouth was broken. Xiao Yiheng hugged him halfway, and sent him to a bench by the shore to rest. The blond hair was wet, and it was wet on his forehead, making him look like a cat that had just taken a bath.
Youyou circled around with concern, she took Xiao Yiheng's hand and asked again, "What's wrong with my brother?"
Li Cheng heard her sister's question, turned around a little embarrassedly, and covered her red ears with a towel.
In the end, Xiao Yiheng answered her question.
"I choked on water just now." Xiao Yiheng patted her head and said solemnly, "Your brother gave me artificial respiration underwater, so he is very tired now and needs a good rest."
Li Cheng: "..."
Really god tm artificial respiration!
I don't know if it's because Xiao Yiheng's expression is too serious, and facing such a wrong answer, Yuyou was really fooled. She sat obediently and waited quietly for her brother to rest.
Li Cheng hid his face under the towel, and after a long time, he suppressed the heat on his face.
Damn, are alphas all those guys who send qing regardless of time and place? He actually attacked him in the swimming pool, causing his toes to get hot from his earlobes.
Because he went into the water without taking off his T-shirt, the white T-shirt on Xiao Yiheng's body was completely wet with water, and it almost became transparent. This way, he wore it on his body as if it was revealing but not revealing, revealing the lines of his body faintly. , more eye-catching than all strips.
Li Cheng sat on the bank for a while, and found that several people were secretly looking at Xiao Yiheng when they passed by them, and some people took out their mobile phones and wanted to take pictures, but were scared away by Li Cheng's eyes!
Li Cheng asked in a muffled voice, "Xiao Yiheng, how long do you have to wear wet clothes?"
Xiao Yiheng was very "obedient", grabbed the collar with both hands, and took off the soaked clothes directly. Before Li Cheng was mentally prepared, Alpha's strong and thin body broke into his sight.
Different from Li Cheng's honey-colored skin, Xiao Yiheng's skin is much whiter because he stays indoors all the year round, but it is not the kind of thin and thin. He was dressed to be thin, undressed and fleshy, with thin muscles covering his skeleton, straight shoulders and a lean waist.
Li Cheng looked away a little shyly, but turned back immediately.
He held his breath, deliberately looked Xiao Yiheng up and down with his picky eyes, and finally a few words floated out of the corner of his mouth: "...Okay, you barely passed the test."
"Reluctantly?" Xiao Yiheng raised his eyebrows, "Brother Li thinks I'm not good enough, please give me more advice."
As he spoke, he put his hand on his arm: "Is the biceps underdeveloped?"
Next, his hand moved to his chest again: "Is the chest muscles not strong enough?"
The hand slid down the chest again, and finally landed on the waist and abdomen: "It's still abs..."
"—Stop!" Li Cheng immediately jumped up from the bench, covered Yuyou's eyes, and scolded him with a blushing face, "There's still a little girl here, what kind of rascal are you playing?!"
However, the little girl tried her best to break open her brother's hand, looked out through Li Cheng's fingers, and shouted repeatedly: "Brother, brother, you want me to get back the abs of the handsome guy."
Li Chengyu asked earnestly: "Youyou, where is the handsome guy with abs? Did you drink too much water when you were swimming just now, and you had hallucinations?"
…
After Li Cheng's persistent teaching all afternoon, Youyou finally learned to swim!
What Li Cheng taught her was the most basic introductory breaststroke. Youyou cooperated clumsily with her hands and feet. She could swim ten meters long enough for Huang Yelun to swim fifty meters.
However, Li Cheng was quite satisfied. When Yuyou worked hard in the swimming pool with her own efforts, the big stone in Li Cheng's heart finally let go.
See, water is nothing to be afraid of. Look, she can beat it.
As soon as Yuyou learned to swim, she became bold and took her brother's hand and said that she wanted to go to the ten-meter slide.
The large slide is the most eye-catching amusement facility in the entire indoor swimming pool, and all the tourists are surrounded by it, enjoying the weightless thrill of going down the river.
"Then... let's do it." Li Cheng hesitated for a while, and allowed his sister's little willfulness.
Yuyou was very happy, hugged the neck of the inflatable flamingo, and dashed towards the slide, and disappeared without a trace.
"Li Cheng, what about me." Xiao Yiheng, who was also in the shallow water area, came over and deliberately imitated Yuyou's tone, "I also want to go to the slide."
"You can't." Li Cheng raised his face, "Youyou has learned to swim, you idiot haven't learned it yet. That slide is dangerous, you can't swim, if you plunge into it when you rush out of the slide What if I can't float in the water?"
"It's okay." Xiao Yiheng pointed to the propaganda board next to him, "Look, there is a two-person slide there, and two people can slide together."
Li Cheng looked in the direction of his finger, and when he saw the photo on the propaganda board, his face turned red.
There are a lot of photos posted on the board, a group of two, all of them are sweet couples. With the assistance of the staff, the young couples hugged each other, lay in the slide, and rushed down the water.
There is also a beating red heart next to the promotional photo, which reads "Enjoy the feeling of extreme weightlessness with your loved one!"
There is just a small problem, the single slide is free, but the double slide is extra, and the price is really not cheap.
Li Cheng's little abacus bead struck again: "No, no, I want to find excitement, why don't I practice the 10-meter platform for tandem? Ten meters, tandem, rapid weightlessness, swimming pool, the four key words are all there, Why should I spend money to find guilt here?"
"..." Xiao Yiheng asked quietly, "Li Cheng, have you only heard the word 'romantic' before??"