横向
1
Large territory under one ruler
5
Advanced stage of human society
6
Metal that replaced bronze in tools
7
Ancient Mesoamerican civilization
9
Long and distinct period of history
10
Collection of traditional stories
纵向
2
Object made by humans from the past
3
Military blockade of a fortified place
4
Alloy of copper and tin used in early tools
8
Practice of establishing foreign colonies