Top: File photo taken in 1958 by Jiang Guoxian shows an epidemic prevention apprentice (L) learning to inject for a pig under the guidance of veterinarian Shi Dechun (C) in Weinan, northwest China's Shaanxi Province. Bottom: Photo taken on July 2, 2019 by Zhang Bowen shows veterinarian Zhang Pu (L) and assistant veterinarian Zheng Xinlong (C) vaccinating for a pig at Yaohui Village of Gaoling District in Xi'an, northwest China's Shaanxi Province. 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)