Guo Mingchang, a successor of Qi writing brush making technique, trims a product in Dawang township of Guangrao county, East China's Shandong province, June 4, 2017. Dawang's Qi writing brush was listed as an intangible cultural heritage of Shandong in 2013. The annual output of writing brush in the town has reached about six million. [Photo/Xinhua]