Jingjing:

Exhibition letter Yue.

I returned to the whale market a month ago and found some chat records on the old computer. You asked me a lot of questions, but I was very rude and abominable at the time. Now I want to ask, has been a long time, are you still willing to listen to me?

Your first question about the speed of the first universe.

If I remember correctly, the speed of the three universes should be the content of the high school physics class. Did you not listen well when you were in class?

There is a small mistake in the question you asked...

Qiao Jingjing sat on the sofa in the living room with a glass of red wine on hand. Seeing it here, she made a slight meal.

Was there a mistake in the question she asked at that time? So when he saw the problem, he was too lazy to take care of it and let her go to Baidu directly.

She was fascinated for a moment, bowed down and continued to look down.

There is a small mistake in the question you asked, and I am afraid to confuse the concept of launch speed and satellite speed. To illustrate clearly, let's start with the definition of the first cosmic speed.

Next, the letter explains in detail what is the first cosmic speed, explains the principles and formulas of the calculation, and draws a schematic diagram of the orbit to snar the derivation process.

Qiao Jingjing's high school physics is not bad, but I have forgotten it so far, but I can see that there is no obstacle, probably because he wrote it is easy to understand.

Through the paper, you can feel the infinite patience of the person writing the letter.

She put down the letter and took another one after a while.

The beginning is still -

Jingjing:

Exhibition letter Yue.

There was a period of leisure in the afternoon, so today's letter will probably be longer. Earlier we have already finished the history and current situation of space development in Germany and the United States. This letter is to talk about the former Soviet Union, a country that is more closely linked to China's space development.

Qiao Jingjing wrinkled his eyebrows. Was the previous letter talking about the speed of the first universe? How did it become a history of German and American space development?

She took all the letters on the coffee table and looked at it again, only to notice that the bottom right corner was marked with the date of writing. A total of nine letters, the first cosmic speed is the first, just the third she has taken.

She picked up the second letter in date order.

Jingjing:

Exhibition letter Yue.

Today in the southern Blizzard, I changed to walk home, thinking about your problems along the way.

The gap between China and the US aerospace level, hey, this question is too big, I may have to answer you with many letters. Let me first talk about the history of modern space development...

The clock in the living room slowly crossed zero, one point, two points... Qiao Jingjing looked at it one by one, and finally, she read the last page of the last letter.

It is undeniable that there is still a big gap between us and the world's top level in the aerospace industry. Sometimes colleagues chat, talk about this, and some colleagues are frustrated and blunt for at least three or forty years.

But the distance of thirty or forty years does not mean that it takes 30 to 40 years to catch up. The meaning of my work with my colleagues is also here.

The comparison between rockets and manned space has been finished. Tomorrow we can talk about deep space exploration. This is my area of ​​specialization. The Voyager, our Jade Rabbit, has a very romantic story. But according to the speed of the post, it is estimated that you could not receive it before.

These letters are always neat and standard at the beginning of the writing. It seems that the person who wrote the letter has to write with the temper to write clearly, but when written and written to the back, some of the nature reveals and becomes flying. Free and easy to squid. In this paragraph, the pen is free to go, but it is also a pioneering development.

However, at the end of the last sentence of the letter, the handwriting was reworked and carefully, as if the person who wrote the letter had finished writing the previous one, stopped the pen, and carefully considered it for a long time before re-writing it -

Jingjing, when you are in the Spring Festival, are you going back to the whale market?

Qiao Jingjing’s gaze stayed in this sentence for a long time and put down the letter.

The clock in the living room shows that it is already three in the morning.

Nine letters, more than four hours, she finally understood what is the speed of the first universe, understand the structure of the rocket, know what is the fairing, what is the payload, know the gap between China and the United States aerospace technology...

The question that the girl’s time was hard to ask, suddenly had a detailed answer.

But it also made her suddenly fragile and sad.

This fragility did not appear on the day when she returned to the car without any problems and let the driver drive.

It did not appear when Ling Jie was mentioned on the way four times.

But in such a late night, in the moment when her teenage girl’s brains were finally answered, the question that was finally answered was finally rushed into the sea.

She got up and walked to the floor to ceiling window.

Time is really too late.

Even Lujiazui, this time to see, the outside is already dark, only a few lights on a sporadic light.

This is the most prosperous area in Shanghai, but many nights, under such a prosperous setting, only make people feel more lonely.

In the same way in the city, did he feel lonely? Did he think of her in this decade?

Probably, after all, her advertisements are scattered all over the streets.

But this is totally different from her thinking of him.

She used a lot of effort to forget him. It seems that once I knew that he had been with other people, he used a lot of effort to delete the silly questions in the chat records one by one.

So forcefully deleted, but too hard, but a sentence is all engraved in my heart.

So when she saw the letter, she knew what he was answering.

Yu Tu probably knows that she remembers, so you see, his letter is so direct, there is not too much explanation, straightforward, straight cut theme.

So how can he be so excessive?

With these seemingly gentle and detailed answers, she cut a knife in her heart.

She licked her sour eyes, returned to the sofa and picked up her phone.

I haven't contacted for two months. In WeChat, his name is already behind, and it took a long time to find it. When the point was opened, the last chat record stayed on the day of the game more than two months ago. She asked him if he had arrived. He answered that he was already in the audience.

How good, such a daily answer.

What she wants is actually nothing more than that.

The line of sight suddenly became a bit fuzzy.

She slammed the fragile tears, lowered her head and calmly entered in the chat box.

"Thank you for your answer."

"But."

"It doesn't make sense to me anymore."