English experts help me translate. help ...

In ancient China, there were three migrations in history, which had a great influence on the south. For the first time, the great integration of southern Yongjia and northern and southern nationalities took away advanced production technology and a large number of laborers. Second, the An Lushan Rebellion, in order to avoid disasters, a large number of northern farmers moved south, which objectively promoted the development of the south; Third, the establishment of the peaceful regime in the Southern Song Dynasty was also a large-scale immigration activity. Today, I focus on the An Lushan Rebellion and the An Lushan Rebellion, which is a milestone in the history of our country and a turning point of the Tang Dynasty from prosperity to decline. The Anshi Rebellion refers to the Anshi Rebellion, which refers to Shimeishi, and the "An Lushan Rebellion" refers to a rebellion in which they dispatched troops to oppose the Tang Dynasty. The rebellion in the first year of An Lushan (755~762 AD) lasted for seven years from the end of Tianbao 14 in the Tang Dynasty to Baoying in Tang Daizong. This historical event had a great influence on the late Tang Dynasty caused by various social contradictions at that time. As for modern immigration or migration, there are a lot of them. As long as there is war, there will be population migration, which is inevitable. As recorded in Going to the Northeast, it is only an episode of people's migration.