横向
1
Union formed for mutual benefit
5
Medieval land-for-service system
7
Ancient Mesoamerican civilization
9
Government elected by the people
10
Legislative assembly of a country
12
Deadly epidemic disease
13
Exchange of goods between peoples
纵向
2
Ancient empire that conquered much of Europe
3
Payment made to show submission
4
Period of ten years
6
Person with no fixed home
8
Period of one hundred years
11
Object made by humans from the past
14
Formal agreement between nations