横向
1
Sudden overthrow of a government
5
Military conflict or fight
7
Ancient Mesoamerican civilization
9
Practice of farming and growing food
10
Medieval land-for-service system
纵向
2
Person who buys and sells goods
3
Payment made to show submission
4
Armed entry into another territory
6
Person who travels to discover new lands
8
Period of ten years
11
Union formed for mutual benefit
12
Exchange of goods between peoples