Archaeologists and engineers are working to restore protective eaves and attics to the 15,000-year-old Yungang Buddhist Grottoes, a world heritage site in northern Shanxi Province, to slow down its weathering.
Geng Jiasheng, 54, a national master technician in the manufacturing industry, is busy working on improvements for a new removable environmental protection toilet, a project he has been devoted to since last year.