In the first class this year, we saw the archaeologists who insisted on their careers and saw that they dug up valuable cultural relics for us with patience and meticulousness. We have seen scientists with dedication and perseverance, and we have seen them sacrifice their personal time to create the miracle of the country; We saw the astronauts who worked day and night for manned space flight. They sacrificed their own and their families' time for hard training and ventured into space exploration. We also saw the athletes who struggled constantly in the Winter Olympics. We saw the bitterness behind them, including Xu who had prepared for the Winter Olympics for many years and Su, a young teenager who dared to challenge.