The middle of this century is from 2040 to 2050. This century is the 21st century. The middle of this century refers to the 1940s to the 1950s. The middle period refers to the middle of a century or dynasty. For example, the middle of the 19th century refers to the 1940s to the 1950s.
About the records of the middle period: "poetry · Shang song · Changfa": "in the middle period in the past, there was shock and industry." Mao biography: "leaves are also the world." Jin Zuosi's Fu on the capital of Shu said: "it is meaningful to test the four seas, and the middle leaves are good at fame." in the preface of Liu Dakui of the Qing Dynasty, "it experienced the Warring States period, won the Qin Dynasty, and declined in the Han Dynasty."
In the second chapter of the romance of the history of the Qing Dynasty by Cai Dongfan, "who knows, there are dragons and snakes in the deep mountains and vast rivers. Since the foundation of bukuliyongshun, it has been said that there have been endless generations. Although there have been ups and downs during this period, by the middle of the Ming Dynasty, a montemu was born. He was very wise and outspoken. He gradually expanded Zuji to the West and moved to Hetu Ala." Lv Cheng's second lecture on the origin of Chinese Buddhism: "Buddhism was introduced into China in the middle of the second century."