"I didn't even know you had a sister."

"Didn't I tell you?" Tang Yue took out a piece of scratch paper and handed it to the old cat from the top of the monitor, "Lao Wang, they all know...... The old cat can't be counted, can you do a prep before giving it to me? This string of numbers is longer than your tail, and the most hellish thing is that it needs to be squared continuously, and the calculator is overflowing. ”

The old cat pulled the paper away, glanced at it, and then handed it back.

"The answer is 42."

"You didn't tell me about it." Mai Dong said, "I thought you were an only child." ”

"I'm not an only child, my sister is three years younger than me, and she has a terrible temper." Tang Yue said, "She was sent by my mother to learn taekwondo since she was a child, and she learned taekwondo and Wing Chun, as well as sanda martial arts and free fighting...... Oh my God, she's still called vulnerable? That girl dared to block the door of a class by herself when she was in elementary school. ”

Mai Dong was stunned.

She didn't expect that she had such a powerful sister-in-law.

"Ever since one summer when we were fighting for the TV remote control, she punched me to the floor, she realized that I couldn't beat her, and since then she is no longer afraid of me, and my dignity as a brother has been completely lost......" Tang Yue talked about the history of blood and tears that he was ravaged by his sister when he was a child, which was simply humiliating and humiliating, and extremely bitter, "Old cat! Look at this, the computer reminds me...... What is this? Fixed Rodrigo parameter ......"

"Roger." The old cat replied briefly, "I'll take over the following." ”

The old cat takes control.

"My sister's grumpy temper is not the most terrible, the most terrible thing is that my parents are still used to her, she played with little boys of the same age when she was a child, and often beat them up like catching chickens and running all over the neighborhood." Tang Yue sighed, "My mother also said that she was a thin little girl and asked her to eat more, but have you ever seen a thin little girl with more developed abdominal muscles than men?" She can split two solid bricks with one punch, and I feel like I might die if she punches me......"

Mai Dong giggled.

She had never seen Tang Yue's sister, and for some reason, a vague shadow of a girl naturally appeared in Mai Dong's mind, full of boyishness, lively and active, and neat.

If Mai Dong was lucky enough to meet that girl, she must be like this, right?

"That's nice." Mai Dong said softly.

"I often comfort myself now: the earth is still there, our relatives and friends are still there, everyone is there, but we can't see them anymore." Tang Yue touched his heart, "My grumpy sister is still living with my parents, and she hasn't graduated yet." ”

"But in fact, the earth has long been ......"

"I always have to give myself a reason to keep living, and I always encourage myself that as long as I can live well, then sooner or later, the earth will reappear." Tang Yue said, "Life without a goal is no different from prison, that is the real despair." ”

He turned his head to look out, the sun outside the window had set, it was dark outside Kunlun Station, and the day had passed.

Tang Yue sat on the chair to do calculations, and unconsciously worked for a whole day, the old cat kept throwing the tasks over, one after another, Tang Yue has been in a state of high mental tension, the only thing that can relieve the psychological pressure is Mai Dong's voice, he chatted with Mai Dong, from the morning to the present, his mouth is dry, and he has to drink water often.

It's just that the joint space station will enter the no-signal area every once in a while, and no one will talk to Tang Yue during this time, once the old cat enters the working state, he will no longer talk, Tang Yue is alone staring at the number formula on the paper and is drowsy, and he is about to fall asleep, and a "Tang Yue can hear me" in the headset can make him refresh.

"The attitude-orbit coupled motion model has been established."

"Start the simulation."

"Secondary Simulation."

"Give me control over the moment curve."

The old cat's two big eyes rolled around and muttered to himself.

It and the computer both work to the point of forgetfulness, and the cat machine is one.

The workstation can work together with the old cat who often abuses it regardless of previous suspicions, which makes Tang Yue quite gratified, HP workstation as a proletarian ideological consciousness is high, and the effect of the integration of the cat and machine is that the work efficiency rises rapidly, Tang Yue has to concentrate on cooperating with them.

Tang Yue didn't even have time to eat dinner.

"Tang Yue, give me α value."

“α？”

"Half major axis, and give me the sine and cosine of the parameter K1 additionally."

"Roger."

"Attitude error?"

"The attitude error has converged to zero."

"The value of the exact Ω gives me mathematical expectations."

"Which Ω? Here are four Ω. ”

"Ascension node right ascension."

"Ascension Node Exiqua Ascension Node Equatorial ...... OK！ ”

The collaboration between Lao Mao and Tang Yue was efficient and rigorous.

"Do you need any more data? Perigee? Orbital inclination? ”

"No need for the time being, Tang Yue, you don't have a task for the time being." The old cat said, "Is Miss Mai Dong still there?" ”

"I'm here, Mr. Cat." Mai Dong replied in the channel, "But the space station is about to enter the no-signal zone." ”

"I don't have any more tasks? You mean I can finally rest, don't you...... I'm sleepy and tired right now. Tang Yue yawned, once the tense nerves relaxed, the strength of his whole body flowed away like water, "It's really terrible, I actually dealt with mathematics all day." ”

"Orbit calculations are physics."

"At the end of the day, it's math." Tang Yue put down the pen in his hand and tidied up the messy desktop, "The differential equations are longer than the other, and the matrices are larger than the other...... I somehow listed a matrix of more than 5,000 orders before, and it scared the hell out of me. ”

"That's your miscalculation."

"I'm not you, I'm going to make mistakes in math for a whole day, my brain is going to explode now, my eyes are severely congested, my fingers are completely stiff, and I can't even hold a pen...... The two of us are obviously another task that can only be completed by engineers of a regiment, so how can I still top a battalion with the results of my work today? Tang Yue opened his five fingers, his fingers were numb, "With my help, isn't the progress a lot faster?" ”

"We did the work that only a regiment of people could do." The old cat nodded, "But what you have done is the normal workload of one person, as for the progress, the big frame has been formed, and the next thing to do is to refine the details." ”

Tang Yue stretched his limbs vigorously, glanced at the clock, and was taken aback, "It's actually half past eleven in the evening, and I've been sitting here for a full fifteen hours...... Did the solar panels come back? If not, please go and put away the solar panels. ”

"You can't go yourself?"

"I have osteoporosis and a herniated disc in my waist."

The old cat pushed the keyboard away, got up and went out, ready to recycle the solar panels, it entered the airlock room, closed the hatch with his backhand, and with a dull "click", Tang Yue was the only one left in the hall of Kunlun Station.

"Tang Yue?" Mai Dong called Tang Yue at this time.

"Huh?"

"Can you tell me more about your childhood? I...... I would like to know more about you. ”

"Okay, I'll tell you everything you want to know without reservation, after all, the old cat makes us get to know each other better." Tang Yue yawned, "But I'm too tired and sleepy, why don't we talk tomorrow...... There will be plenty of time tomorrow. ”

The sleepiness came up, and he really couldn't stop anything, even if the table was full of nails, he wanted to plant it headlong.

"Are you really so tired?"

"I'm really tired."

"That'...... Stay with me for another ten minutes? Mai Dong hesitated, "Five minutes?" ”

Tang Yue smiled and cheered up, "If you have anything to say, just say it, I will accompany you until tomorrow morning, it's a big deal that I won't sleep tonight." ”

"Okay, you said you would stay with me until tomorrow morning."

"That's it." Tang Yue yawned.

"Tell me about your sister again."

"She? That's a horrible violent woman, the kind that can smash a door with a single punch. ”

Tang Yue sat on the chair, leaning on the back of the chair and curling his legs, looking up at the dim and soft light overhead, the past on the earth had only passed a year for him, but the memories were extremely distant. Somehow Mai Dong suddenly became interested in his story, Tang Yue told the girl about the stupid things he did when he was a child, such as cheating in the exam in elementary school and copying the answers to the adjacent table, only to find out that it was the AB paper after the exam, the middle school chemistry class put sodium in his pocket, and the clothes caught fire, and the English test listening test finished all the questions in the audition time, Mai Dong kept laughing and laughing.

"I see the sun, and the space station is about to enter the no-signal zone." Mai Dong said her voice was indistinct, possibly because the signal was unstable.

"Wait until you get back." Tang Yue rubbed his eyes.

"Tang Yue."

"Huh?"

"You said we had both decided to get married, and you never told me about ......," Mai Dong said, "and I took the initiative to speak every time." ”

Tang Yue was stunned for a moment, a little embarrassed.

"Three words you want to hear? Four words? Or five words? ”

"Not now, you'll tell me when I get back." Mai Dong said, "So...... Don't fall asleep, don't fall asleep until I come back. ”

"Okay." Tang Yue nodded.

Moments later, contact was lost, and the Joint Space Station entered a no-signal zone.

I don't know how long it took, the channel was quiet, Tang Yue propped his head, looking at the electronic clock in front of him, the time had reached twelve o'clock, the red numbers were beating second by second, how long would it take for the joint space station to enter the no-signal area? Half an hour? Twenty minutes? I can't remember exactly...... Tang Yue stared at the time blankly, his brain seemed to be spinning, and it seemed to be mixed into a mess.

He wanted to think about something to dispel his sleepiness, the numbers on the clock gradually distorted under his eyes, Tang Yue suddenly found that he didn't even know the numbers on the clock, he stared at the number for a long time, and he didn't know what it was.

Tang Yue knew that his brain had begun to strike, his cognitive function had completely faded, the information received by his eyes was rejected by his brain, and a pair of eyelids weighed like a thousand pounds.

Can't sleep.

Don't fall asleep.

Who's going to slap themselves?

What about the old cat...... The old cat hasn't come back yet.

Why hasn't it come back yet......

Heavy tiredness rose up, Tang Yue dared to pack tickets He had never been so sleepy in his life, the scene in front of him began to blur, and after the brain, the rest of the body also struck one after another.

Tang Yue pinched his cheek hard, trying to sober himself up.

But the next moment it was dark and the world was dark.