Left: File photo taken in 1977 by Zhu Li shows railway stewardess Di Jingru from Shijiazhuang railway crew section serving hot water for a passenger aboard a train. Right: Photo taken on Jan. 21, 2019 by Bao Liang shows a bullet train attendant gifting spring festival-themed posters to a passenger aboard the train D1867 from Chongqing in soutwest China to Guangzhou in south China. 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)