横向
1
Person who travels to discover new lands
5
Long and distinct period of history
6
Military blockade of a fortified place
7
Medieval land-for-service system
8
Exchange of goods between peoples
9
Deadly epidemic disease
10
Armed entry into another territory
纵向
2
Freedom from outside control
3
Person who buys and sells goods
4
Payment made to show submission
11
Ancient Mesoamerican civilization
12
Practice of farming and growing food