横向
1
Long and distinct period of history
3
Alloy of copper and tin used in early tools
4
Armed conflict between nations
6
Territory controlled by another country
7
Ancient Mesoamerican civilization
8
Practice of farming and growing food
9
Payment made to show submission
纵向
2
Formal agreement between nations
3
Military conflict or fight
5
Person owned as property
10
Exchange of goods between peoples