A researcher of Shaanxi Provincial Institute of Archaeology introduces the Liujiawa archaeological site of the Eastern Zhou Dynasty (770-256 B.C.) in northwest China's Shaanxi Province, July 5, 2019. More than 30 archaeological enthusiasts visited Weinan archaeological base and Liujiawa archaeological site of the Eastern Zhou Dynasty on Friday. Under the guidance of archaeologists, they learned to use tools such as Luoyang shovel and hand shovel, experiencing the archaeological work up-close. (Xinhua/Li Yibo)