Reverse talent flow: Refers to the phenomenon of professionals who originally worked in well-known big cities and chose to work in small and medium cities. Which of the following is the counter flow of talent? ["The county of Xiao Zhao's hometown has experienced rapid economic development in recent years. He is hiring professionals with a working background in a large city. After repeated consideration, Xiao Zhao resigned from a research department in Beijing and returned to his hometown to apply successfully.", 'Xiao Han, who has graduated from high school, has worked hard in Shenzhen for many years. I deeply feel that although there are many job opportunities and considerable annual income, but the pressure of competition is too great, sometimes it can not help.', "Xiao Huang obtained a master's degree in bridge design from a university in Tianjin and came to the small city where his girlfriend is located to find a good job. He and his girlfriend are very happy.", 'er D.80, white-collar Xiao Li served at the headquarters of a financial institution in Shanghai. A few days ago, she decided to move to a nearby insurance company. However, she nextectedly found that her decision coincided with the choice of many colleagues.']