Genius is just the threshold for me!

Because the next day was Saturday, the group chatted at the bubble tea shop until 9:30 pm before they started to leave.

Huang Qingyao, holding the second cup of milk tea that the big spender had packed, bid farewell to Lin Dong with great emotion and in an exaggerated manner before leaving.

"Thank you for your hospitality, Young Master Lin."

"Get lost."

Lin Dong led Xu Qingling out of the milk tea shop, and upon hearing this, he immediately waved his hand in annoyance.

"Alright, I won't bother you anymore."

Huang Qingyao responded, humming a song, and walked towards the residential area with Xia Ran and the others.

But as soon as they got downstairs and parted ways with Su Yue and the others, Xia Ran grabbed them and pulled them upstairs to Xia Ran's house.

"What?"

Huang Qingyao was pulled into Xia Ran's room. She hadn't even taken two sips of her milk tea when she jumped up on the spot, staring at Xia Ran in shock: "Qingling knows you like Lin Dong? How did she know?"

"I had some suspicions before, but I didn't pay attention to them. I just confirmed it, right?" Xia Ran replied in silence.

"hiss--"

Huang Qingyao took a breath, her eyes wide, and asked, "Aren't you guys going to fight? If you do, whose side should I take? Or should I just order some milk tea and watch the show?"

"...Yao Yao!"

Xia Ran rolled her eyes: "I called you up here to get some advice, not to watch a show..."

"I have no idea either."

Huang Qingyao shrugged: "There's a saying that goes, best friends can interfere in everything except men... I wouldn't be surprised if you two started fighting now."

"I never said I wanted to interfere. I've been a student at Chengdu Aircraft Industry Group for three years since I transferred here, and I've only spoken to Lin Dong alone twice..."

Looking at the pet robot that Lin Dong had given her, Xia Ran sat on the bed with her arms wrapped around her knees and said, "From childhood to adulthood, you guys have been my only friends."

"Oh, I see. The feeling of unrequited love is the most addictive. You have to enjoy the feeling of unrequited love, and then you can interfere later..." Huang Qingyao suddenly realized.

"Yaoyao, can you please stop watching so many ridiculous TV dramas?" Xia Ran couldn't hold back any longer.

"Don't worry, as long as you don't say you're going to interfere."

Qingling's personality and way of dealing with people aren't that sensitive and narrow-minded... although I think you wouldn't have a chance even if you wanted to interfere.

Huang Qingyao took a sip of milk tea and calmly said, "Let's not talk about Lin Dong after all these years."

Uncle Lin, Aunt Xia, Lin Dong's uncle, Lin Dong's godfather Uncle Wang, godmother Aunt Su, and even Lin Dong's maternal grandparents and paternal grandparents all accepted and recognized her identity. This is not something that can be achieved simply by saying "arranged marriage".

As long as Lin Dong gives her confidence, and as long as you don't directly express it, she will never worry unnecessarily...

After all, Lin Dong is quite handsome and has an attractive personality.

Eight out of ten girls in our school have feelings for him.

Even several classmates in our class, knowing that he was with Qingling all the time, still asked me to help deliver love letters to him... But as long as Lin Dong's attitude didn't change, Qingling didn't take any of them to heart.

So you don't need to worry that Qingling will have a bad opinion of you because she knows you like Lin Dong.

Lin Dong held her hand and gave her a hug, and then she put the whole thing aside.

But this is also the most important point...

You said Qingling had noticed before, which means Lin Dong knew you were paying attention to him and gave Qingling comfort and confidence, but he just hadn't taken it seriously.

"I know."

Xia Ran paused for two seconds, then smiled and said, "He's a sentimental person. It's hard for him to care about people he's just met. Apart from Qingling, he's never cared about the opinions of other girls."

"You know you still have to like it?"

Huang Qingyao couldn't help but complain: "Is puberty really this outrageous? How come I don't feel anything? Oh no, am I just growing physically but not emotionally?"

"By the time you realize it, it will be too late."

Xia Ran glanced at Huang Qingyao and urged her to hurry back, saying, "Go back quickly, I want to sleep."

"No way! You dragged me up here, asked for my opinion, and now you want me to leave?"

Huang Qingyao put down her milk tea, pounced on Xia Ran on the bed, and chuckled wickedly, "I'm sleeping here tonight, and nobody can kick me out... Lin Dong is probably comforting Qingling right now, so I'll comfort you too!"

"Ah! Huang Qingyao, don't be like Lala, okay..." Xia Ran hurriedly broke free, but was pulled back the next second.

Sigrún has taught at the Iceland University of the Arts as a part-time lecturer since and was Dean of the Department of Fine Art from -. In – she held a research position at Reykjavík Art Museum focusing on the role of women in Icelandic art. She studied fine art at the Icelandic College of Arts and Crafts and at Pratt Institute, New York, and holds BA and MA degrees in art history and philosophy from the University of Iceland. Sigrún lives and works in Iceland.

The next morning at 10:30, Lin Weiliang and Zhang Xiali finished breakfast and went out, while Lin Dong remained in bed.

"Dongdong, wake up..."

Then, there was a cracking sound.

Xu Qingling opened the door and walked in. Seeing that Lin Dong was still sleeping, she immediately stopped making any noise and walked over quietly, reaching out to pinch Lin Dong's nose...

"What do you want to do?"

Suddenly, Lin Dong opened his eyes, grabbed Xu Qingling's hand, and pulled her forward.

"oops!"

Xu Qingling exclaimed in surprise, then clung to Lin Dong, her hair falling across half the bed. She blinked innocently and said, "Dongdong, it's past ten o'clock, get up! Daddy went to the hottest place early this morning..."

"Wake me up? I think you just want to pinch my nose..."

Lin Dong pinched Xu Qingling's nose and then said, "You're not allowed in my room in the mornings anymore, you have a bad temper."

"What do you mean by being hot-tempered...?"

Xu Qingling was stunned for a moment, but the next second she seemed to sense something, her expression froze, and she immediately jumped up, her eyes wide and her face red, saying, "I...I'll go make you breakfast, you hurry up and get up and brush your teeth."

talking.

Xu Qingling couldn't help but glance at it, then hurriedly turned and ran to the kitchen.

"..."

Lin Dong watched the girl's flustered figure, changed his clothes, got up, brushed his teeth, and washed his face.

Ten minutes later, Lin Dong went to the restaurant to get his breakfast. Looking at Xu Qingling, whose face was still flushed, he smiled and asked, "What time did Uncle Xu go?"

"I got up around six o'clock..."

Xu Qingling also brought a small breakfast for herself and ate with him, saying softly, "I also got up around eight o'clock because my mother told me... You're the one who slept the latest."

"Even if I get up early, it won't help."

Lin Dong smiled, finished his breakfast, grabbed a bottle of milk, and the two of them went to Laboratory 78 and entered Xu Ziming's assembly workshop.

"Oh, you're up?"

Xu Ziming was sitting outside drinking tea when he saw Lin Dong leading Xu Qingling over. His face immediately darkened: "I asked you to come and keep an eye on things yesterday... It's already eleven o'clock."

"Uncle Xu, experts say teenagers need more sleep to grow taller, I just trust your skills," Lin Dong said with a smile. "There shouldn't be any problems, right?"

"No problem, go in and see for yourself," Xu Ziming replied irritably.

"Let me see..."

Lin Dong led Xu Qingling into the adjacent workshop, where a dark gray aircraft, which looked nine-tenths similar to the Hot No. 4 under the lights, appeared before them. However, the waverider structure of the fuselage was more prominent, and the engine, which was integrated with the fuselage, was significantly shorter.

"Dongdong, you seem even rounder now..."

Xu Qingling looked at Hot5, whose overall structure was still a rhomboid triangle, but whose leading edge was noticeably more rounded than Hot4's aerial photography of Earth, and asked curiously, "Isn't it faster?"

"This involves trade-offs in resistance, temperature, and materials..."

Lin Dong smiled and said, "The sharper and more angular the leading edge of the fuselage, the easier it is to break through the shock wave, and the less resistance there will be. However, the temperature of the sharp leading edge that breaks through the shock wave will also be higher."

The blunter and rounder the line, the greater the resistance, but the lower the temperature at the leading edge that breaks the shock wave.

Previously, the thrust-to-weight ratio and thrust of the scramjet engine were relatively weak, so the leading edge of the Hot 4 fuselage needs to be sharper to reduce flight drag.

The current knock engine has a higher thrust-to-weight ratio and thrust, so the leading edge of the fuselage can be blunter, and the engine thrust is sufficient.

Another point is that the Hot 5 was designed to reach a top speed of Mach 16, which generates even higher temperatures due to aerodynamic friction. If the leading edge of the fuselage is also that sharp, no material can withstand it...

This is similar to how the bottom of a space capsule in contact with the atmosphere must be designed as a large circle; one reason is to increase drag and slow down the vehicle, and the other is to reduce temperature.

"Oh, I see..." Xu Qingling nodded happily.

"Xiao Dong!"

At this moment, Wang Xingguo, who had been observing the research, poked his head out and asked curiously, "How much did it cost to build this Hot Air No. 5?"

"Well!"

Lin Dong shook his head: "Uncle Xu paid for it, I don't know..."

Because he received a portion of the ownership of the lithium battery patents, Xu Ziming is now a wealthy man.

But perhaps because he acquired the patent ownership too easily and the profits were too high, Comrade Xu always felt uneasy. Recently, when facing him, he has been somewhat lacking in confidence.

And as it turned out, after paying this fee, Xu Ziming dared to give him a hard time every day again...

"Excluding the costs of early research and development testing, the current fuselage costs 10 billion yuan, each engine costs 1.2 million yuan, and the twin-engine configuration costs about 12.4 billion yuan... a little more than three times the weight of gold."

Xu Ziming's voice came from outside.

"What the hell? More than three times the weight of gold?"

王兴国一下子瞪大眼睛：「歼-16d也就15亿，歼-20也就7亿，这一架空重一吨多的飞行器就12个亿？」

"My goodness..."

Jiao You also peeked out, and looking at the dark gray "Hot No. 5," he couldn't help but click his tongue in amazement, "So, if I just make a cut with a file, it'll be worth tens of thousands of yuan?"

"Jiao Gong, the material cost for the repair is over ten thousand, but the repair process will cost several million," Xu Ziming said with a smile.

"Where is it so exaggerated? I can't see it at all..." Wang Xingguo looked around and couldn't help but say.

The Hot 4, at least, has a super-powerful aerial photography cannon; you can tell at a glance that it's a custom-made piece costing tens of millions.

But for Hot No. 5, Lin Dong only equipped it with a laser system, which costs at most a few million.

"Because the design speed is Mach 16, the entire thermal protection layer and fuselage structural materials were completely replaced, and almost all of them were laboratory materials, with no industrially mass-produced materials."

Xu Ziming explained simply: "The original hafnium carbide protective layer was replaced with a high-entropy tantalum carbide hafnium protective layer, which increased the material cost from 1.3 yuan per kilogram to 10.8 yuan per kilogram. In addition, the manufacturing process of the tantalum carbide hafnium protective layer is much more difficult, so the cost skyrocketed..."

"So, building this thing is like sprinkling gold powder on it, and every bit you sprinkle, two bits fall off..." Wang Xingguo suddenly realized.

"Uncle Wang, Lin Dong said that this engine needs to be overhauled and replaced after more than a hundred hours of use," Xu Qingling added with a smile.

"Over 100 hours of major repairs... costing 240 million yuan, with the repair cost calculated at 40% to 50% of the total cost."

Wang Xingguo quickly calculated in his mind, then his eyes widened and he said, "Good heavens, your whole family, are you trying to show off your wealth to me?"