Jingjing:
Show Xinyue.
I went back to Whale City a month ago and found some chat records in my old computer. You asked me a lot of questions, but I was very rude and hateful at the time. Now I want to ask, after a long time, are you still willing to listen to my answer
Your first question is about the first cosmic velocity.
If I remember correctly, the three cosmic velocities should be the content of high school physics class. Did you not listen carefully in class
There is a small error in your question...
Qiao Jingjing sat curled up on the sofa in the living room with a glass of red wine in her hand. Seeing this, she paused slightly.
So the question she asked at that time was wrong? So he didn't bother to answer the question when he saw the problem, and asked her to go to Baidu directly
She froze for a moment, then lowered her head and continued to look down.
There is a small mistake in your question, which may confuse the concepts of launch speed and satellite operation speed. For the sake of clarity, let's start with the definition of the first cosmic velocity.
Next, the letter explained in detail what the first cosmic speed was, explained the principles and formulas of the calculation, and also drew a schematic diagram of the orbit to explain the derivation process.
Qiao Jingjing's high school physics was pretty good, but she'd forgotten all about it by now, but there was no problem in reading it, probably because his writing was so detailed and easy to understand.
Through the paper, you can feel the infinite patience of the person who wrote the letter.
She put down the letter and picked up another after a while.
The beginning is still-
Jingjing:
Show Xinyue.
I suddenly have some free time in the afternoon, so today's letter will probably be longer. We have already talked about the history and status of aerospace development in Germany and the United States. In this letter, we will talk about the former Soviet Union, a country that is more closely related to my country's aerospace development.
Qiao Jingjing frowned, wasn't the previous letter talking about the first cosmic speed? How did it become the history of German and American aerospace development
She picked up all the letters on the coffee table and read them, only to notice that the date of writing was marked in the lower right corner. There are a total of nine letters, the first cosmic speed is the first, and she has just received the third letter.
She picked up the second letter in chronological order.
Jingjing:
Show Xinyue.
Blizzard in the South today, I walked home instead, thinking about your problem along the way.
The gap between the level of aerospace between China and the United States, well, this question is too big, and I may have to answer you in many letters. In this letter, let's talk about the history of the development of modern aerospace...
The clock in the living room slowly crossed zero, one, two... Qiao Jingjing read 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 field. Sometimes colleagues chat, talk about this, and some colleagues are frustrated, bluntly at least thirty or forty years.
But the distance of thirty or forty years does not mean that it takes thirty or forty years to catch up. One of the meanings of my work with my colleagues is this.
The comparison between rockets and manned spaceflight has been finished. Tomorrow we can talk about deep space exploration, which is my area of expertise. 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 years ago.
In these letters, Yu Tu's handwriting was always neat and standard at the beginning, as if the person who wrote the letter was patient to write clearly, but as he wrote it, some of his nature was revealed and became flying. Free and easy and slightly scribbled. At this stage, the pen is free to move, and it is even more vigorous and hard-edged.
However, when it came to the last sentence at the end of the letter, the handwriting became neat and careful again, as if the writer of the letter had finished writing the previous one, stopped writing, and after careful consideration for a long time, he started again—
Jingjing, are you going back to Whale City during the Spring Festival
Qiao Jingjing's eyes stayed on these words for a long time before putting down the letter.
The clock in the living room showed that it was already three in the morning.
Nine letters and more than four hours, she finally understood what the first cosmic speed is, the structure of a rocket, what a fairing is, what a payload is, and the gap between China and the United States in aerospace technology...
The questions that Girls' Generation struggled to ask were suddenly answered in detail.
But it also made her suddenly vulnerable and sad.
That vulnerability didn't show up that day when she returned to the car nonchalantly and let the driver drive.
She didn't appear when Sister Ling mentioned Yutu over and over again.
But in the middle of the night, at the moment when the question she had racked her brain for in her girlhood was finally answered, an overwhelming amount of things came to her mind.
She got up and walked to the floor-to-ceiling window.
It's really too late.
Even Lujiazui could see it at this time, and it was already pitch black outside, with only a few lights lit sporadically.
This is the most prosperous area in Shanghai, but many nights, against such a prosperous backdrop, it only makes people feel more lonely.
Yu Tu was also in this city, did he ever feel lonely? In the past ten years, has he thought of her
Probably there is, after all, her advertisements are all over the streets and alleys.
But it was completely different from her thinking of him.
It took a lot of effort for her to forget him. It was as if once, after knowing that he was with someone else, he used a lot of strength to delete the silly questions in the chat records, sentence by sentence.
So forcefully delete it, but too forcefully, but all the sentences are engraved in my heart.
So as soon as she saw the letter, she knew what he was answering.
Yu Tu probably also knew that she remembered it, so you see, his letter is so direct, without too much explanation, straight to the point, straight to the point.
So how could he go so far
With these seemingly gentle and detailed answers, she stabbed her heart again.
She blinked her sour eyes, went back to the sofa, and picked up the phone.
I haven't contacted him for two months. In WeChat, his name is already in the back, and it took a long time to find it. Clicking on it, the last chat record was still on the day of the game more than two months ago. She asked him if he had arrived, and he replied that he was already in the audience.
How nice, such an everyday answer.
What she wanted was actually nothing more than that.
His vision suddenly blurred.
She blinked away those fragile tears, lowered her head, and typed in the chat box calmly.
"Thank you for your answer."
"but."
"It doesn't make sense to me anymore."