After the Covid break, this is the first day back to school. In my heart, I am very excited and happy to be back at school and see my teachers and friends again. I will have interesting lessons with friends and teachers, but I am also quite worried because the Covid epidemic is still raging, so I often recommend you to watch 5K. First: Wear a mask. Second: Disinfection. Third: Distance. Fourth: Do not gather. And finally: Medical declaration. And my first class after days of online and online learning was math. During the quarantine period, I still review my knowledge regularly, so I am not surprised when I go back to school. However, today's class is not as busy as before, because the class size has been divided. Looking at the class, looking at the school, friends, students limit contact to avoid the Covid epidemic, so it's a bit sad, a bit strange. Before going back to school, my mother bought a Covid test and carefully made a Covid test for herself. And luckily, I'm fine. How about you? I hope you all stay healthy so we can get through the Covid pandemic together. Remember to regularly wear cloth masks in public places, places where people gather; wear medical masks at medical facilities, isolation areas, wash hands often with soap or hand sanitizer. Clean frequently touched surfaces/items (doorknobs, phones, tablets, furniture, etc.). Maintain hygiene, cleanliness and keep the house well ventilated, keep a distance when in contact with others, DO NOT gather in large crowds, finally declare illness at the clinic or hospital. I really want you to be happy.                                      Thank you everyone for listening.                                       Goodbye everyone