横向
1
Military blockade of a fortified place
4
Large territory under one ruler
5
Person with no fixed home
6
Ancient Mesoamerican civilization
7
Government by the people
11
Ancient empire that conquered much of Europe
纵向
2
Person who travels to discover new lands
3
Deadly epidemic disease
8
Period of ten years
9
Exchange of goods between peoples
10
Medieval land-for-service system