On the afternoon of May 5, my country's first international mainstream airliner C919 made its maiden flight, marking the beginning of a new chapter in the Chinese nation's half-century aviation dream. The C919 adopts a variety of sensing technologies. For China, the C919 is not only as simple as a trunk airliner, it means that China's civil aviation will no longer rely on foreign imports, and China's aircraft manufacturing has truly embarked on a major development road of independent research and development. .