Top: File photo taken in 1960 by Huang Jingda shows bus conductor Shu Zhiying working on a bus in Beijing, capital of China. Bottom: Photo taken on June 27, 2019 by Huang Zongzhi shows a passenger paying for ticket via mobile payment in Hangzhou, capital of east China's Zhejiang Province. In many cities of China, the payment method of public transportation has progressed from cash, IC cards to today's QR code scanning. 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)