Researchers repair 5,000 square meters of fresco in 70 years

To protect the cultural relics in Mogao Grottoes in Dunhuang, preservationists and researchers have been "examining and healing" the frescoes and other relics since the establishment of Dunhuang Protection Agency in 1944. Till now, more than 5,000 square meters of fresco and 280 grottoes have been repaired.