Three-two-one, fire !
At the moment of 9:43 a. m. on Tuesday, June 23. 2020, at the Xichang Satellite Lamnch Center（卫星发射中心）in Sichuan Province, the last satellite of the third-generation network（第三代导航系统）was sent into space. It is the 55th member in the family of Beidou. It belongs to China's Beidou Navigation Satellite System（BDS 北斗卫星导航系统）. So far, 59 satellites, including the first four test ones, have been launched from Xichang. With the development of China, we have already owned three other famous satellite launch centers—Jiuquan, Taiyuan and Wenchang.
After a period of tests in space, this new satellite has started to work with other Beidou satellites together. It is designed to work for at least 12 years. So far, China has completed the third-generation network of China's BDS. It was a new milestone in the nation's research work. The launch showed our country has completed our largest space-based system. It's one of four global（全球的）navigation networks, including the United States' GPS, Russia's GLONASS and the European Union's Galileo.
BDS has been widely used as public resources（资源）in our daily life, It has been shared by the whole world, It will provide more services around the world. BDS is the common wealth of the development of human beings.
