Staff members at a public bicycle maintenance center repair the rear wheel of a public bicycle on a workbench in Taiyuan, Shanxi province, Nov 12. The staff members introduced their inventions for saving energy and improving work efficiency, such as a maintenance workbench for bicycle rear wheels, and a gasoline filter and regenerator. It previously took over six hours to repair 50 rear wheels, while now, using the workbench, it takes around four and a half, according to Kang Jifeng, director of the public bicycle maintenance center. [Photo/sxrb.com]

Staff members at a public bicycle maintenance center use a gasoline filter and regenerator in Taiyuan, Shanxi province, Nov 12. The piece of equipment, invented by the staff members during their daily work, will help companies save 85 to 90 percent of the gasoline which once was removed as scrap, without causing any pollution. [Photo/sxrb.com]