![](http://www.ecns.cn/hd/2019/11/21/766ceab8943f49d286603fd983e160ca.jpg)
Archaeologists from the French National Institute for Preventive Archaeological Research (INRAP) work on an underground burial site from the neolithic period, dating back 3500-3000 BC in Saint-Memmie, central eastern France, on November 20, 2019. (Photo/Agencies)
![](http://www.ecns.cn/hd/2019/11/21/deefcbb40a5e453f9e7d908a89b57e7b.jpg)
An archaeologist from the French National Institute for Preventive Archaeological Research (INRAP) works on an underground burial site from the neolithic period, dating back 3500-3000 BC in Saint-Memmie, central eastern France, on November 20, 2019. (Photo/Agencies)
![](http://www.ecns.cn/hd/2019/11/21/54212e008035430ca4a1061679a88729.jpg)
An archaeologist from the French National Institute for Preventive Archaeological Research (INRAP) works on an underground burial site from the neolithic period, dating back 3500-3000 BC in Saint-Memmie, central eastern France, on November 20, 2019. (Photo/Agencies)