1 People pass by the 3D-printed retractile bridge in Shanghai on Monday. (Photo: Yu Xi/GT) China's first 3D-printed retractile bridge has been unveiled in Shanghai, seen as a move for further attempts in 3D printing technology on retractile architecture. The bridge is 9-meter-long, 1.5-meter-wide and 1.1-meter-high, weighing only 850 kilograms. It is divided into 9 retractile segments, the Global Times learned from the Wisdom Bay, a park cultivating innovative firms in Shanghai. Along the two sides of the bridge, there are a total of 36 triangle panels which we...