Top: File photo taken in 1959 by Li Jingrui shows veterinarian Yu Zhongxue explaining livestock disease knowledge to local women in Menyuan Hui Autonomous County, northwest China's Qinghai Province. Bottom: Photo taken on June 27, 2019 by Zhang Long shows Liu Wenxian, head of a county-level animal husbandry and veterinary station, explaining knowledge of prophylaxis and treatment on echinococcosis to village-level animal epidemics prevention personnel at Qagan Dabuu Village of Suzitang Township in Menyuan. In 1949 when the People's Republic of China was founded, the Chinese people faced a devastated country that needed to be rebuilt from scratch after decades of warfare and chaos. After decades of unremitting endeavors and dedication by the Chinese people, China has grown to be the world's second largest economy. In 1952, China's GDP was 30 billion U.S. dollars, while in 2018, its GDP reached 13.61 trillion U.S. dollars, an increase of 452.6 times. A group of combo photos give you a glimpse of what Chinese people did decades ago and what they do right now. Undoubtedly, people from all walks of life in China with hard work and wisdom have made contributions to the country's development. (Xinhua)