![A pottery mould unearthed at the Guanzhuang ruins in Henan Province. Excavation work at the site\'s bronze casting area has revealed bronze-making techniques dating back to the Zhou Dynasty (1046-256BC). (Photo/Xinhua)](http://www.ecns.cn/hd/2019/03/06/f3d898228a37486bb3c6b65dd72a9bb9.jpg)
A pottery mould unearthed at the Guanzhuang ruins in Henan Province. Excavation work at the site's bronze casting area has revealed bronze-making techniques dating back to the Zhou Dynasty (1046-256BC). (Photo/Xinhua)
![Relics unearthed at the Guanzhuang ruins in Henan Province. Excavation work at the site\'s bronze casting area has revealed bronze-making techniques dating back to the Zhou Dynasty (1046-256BC). (Photo/Xinhua)](http://www.ecns.cn/hd/2019/03/06/ab79b9cf965c4da3ab3191b5c6ae738f.jpg)
Relics unearthed at the Guanzhuang ruins in Henan Province. Excavation work at the site's bronze casting area has revealed bronze-making techniques dating back to the Zhou Dynasty (1046-256BC). (Photo/Xinhua)
![Relics unearthed at the Guanzhuang ruins in Henan Province. Excavation work at the site\'s bronze casting area has revealed bronze-making techniques dating back to the Zhou Dynasty (1046-256BC). (Photo/Xinhua)](http://www.ecns.cn/hd/2019/03/06/67085a54b5244c9bb27b1024eb949860.jpg)
Relics unearthed at the Guanzhuang ruins in Henan Province. Excavation work at the site's bronze casting area has revealed bronze-making techniques dating back to the Zhou Dynasty (1046-256BC). (Photo/Xinhua)
![Relics unearthed at the Guanzhuang ruins in Henan Province. Excavation work at the site\'s bronze casting area has revealed bronze-making techniques dating back to the Zhou Dynasty (1046-256BC). (Photo/Xinhua)](http://www.ecns.cn/hd/2019/03/06/b7baaddbe13748969b811fb82d8909cf.jpg)
Relics unearthed at the Guanzhuang ruins in Henan Province. Excavation work at the site's bronze casting area has revealed bronze-making techniques dating back to the Zhou Dynasty (1046-256BC). (Photo/Xinhua)
![Relics unearthed at the Guanzhuang ruins in Henan Province. Excavation work at the site\'s bronze casting area has revealed bronze-making techniques dating back to the Zhou Dynasty (1046-256BC). (Photo/Xinhua)](http://www.ecns.cn/hd/2019/03/06/c51b581897094ef59e6d10947a777cdc.jpg)
Relics unearthed at the Guanzhuang ruins in Henan Province. Excavation work at the site's bronze casting area has revealed bronze-making techniques dating back to the Zhou Dynasty (1046-256BC). (Photo/Xinhua)