What kind of short story does the sketch introduce about Uncle Zhai Zhigang?

Dear Shenzhou VII astronaut Dear Uncle Zhai Zhigang, Shenzhou VII astronaut:

Hello! I am You Fangyuan, a student in Class Two, Grade Five, Jiangnan Shuidu Primary School, Fuzhou. I have heard your name on TV for a long time. I am writing this letter today to communicate with you. During the launch of Shenzhou VII in 2008, Chinese astronauts left the capsule for the first time. On the same day 15: 00, the activity began. It's so difficult for you to put on your extravehicular activity suit, tie the rope and get up your courage. Do you know that?/You know what? How worried we are about you! "Fly out, fly out!" I cried in surprise. How excited and proud the people of China were when the first five-star red flag fluttered in space! Later, on the return flight, we heard the astronauts in the cabin report that there was a fire, and we were very nervous. But you said, "the hatch is open, so it won't catch fire!" " "It was later verified that it was a false alarm of the sensor and had no effect on future flights. After this incident, my admiration for you arises spontaneously. You are the pride of China people! However, who knows how much you paid for this extravehicular activity?

In order to simulate the vacuum environment, you suggested to NASA to train with high-density water. You repeatedly trained in high-density water, which led to rheumatoid arthritis. Instead of giving up, you trained harder. You must be thinking: Let's fight for the people of China!

Uncle Zhai Zhigang, you are an example for us to learn. I promise you, I will be a pillar of the country when I grow up!

hope

Everything goes well in your work.