In the past, the size of cities depended on the amount of food that can be produced in the surrounding areas. Therefore, the most densely populated cities are distributed in watershed areas, such as the Nile River Basin and Crescent Fertile Land. With the development of the Industrial Revolution and the establishment of factory systems, Large numbers of people are pouring into the new industrial centers. A large number of people in the new cities are supported by food from around the world. Advances in technology and medicine can adequately supply clean water, improve centralized drainage systems and waste treatment systems, and ensure adequate The advancement of food supply and the prevention and control of infectious diseases have made urban life more comfortable, and cities around the world have begun to develop at an extremely fast pace. The text mainly says:. ['The industrial revolution has driven urbanization around the world.', 'The occurrence of the Industrial Revolution has changed the way people live.', 'Expansion of food access channels leads to rapid urban population growth.', "Advances in technology and medicine have improved people's living standards."]