"Time flies, the sun and the moon fly." Twenty years have passed in a flash! I am 29 years old, in 2035. I am a doctor now. Today, I flew back to my long-missed hometown-yinan county. When I first arrived in the county seat, I was surprised by what I saw. There is no sludge and garbage in the street. The exhaust gas from the original car will pollute the environment. Now, a "smoke eliminator" is installed at the rear of each car, which will absorb the exhaust gas bit by bit. Let people live in an elegant and quiet environment, which is the real environmental protection. Come to the door, ah! The original building has been replaced by beautiful villas, and each villa is made of plastic and aluminum alloy, which is very strong. I was in a daze when the robot came out to meet me and said to me, "little master, you can come back." I have been waiting for a long time. " We miss you very much. "When I met my mother and father, they were as young as when I left. Twenty years ago, I thought they had become old men and women. My mother said that China's medical and health undertakings have developed rapidly, and we are only in our fifties and early thirties. My mother showed me around the room, which was spacious and bright, and the air was fresh. Mom said that as long as you sit on the sofa and press the ammonium button, the robot nanny can have whatever she wants, which is very convenient. I didn't expect my hometown to change so much in just 20 years. Among many words, I only think the word "hometown" is the kindest and warmest. Whether it is a backward hometown or a modern advanced hometown. As long as I come back here, it will make me feel particularly warm.