横向
1
Armed conflict between nations
3
Ancient empire that conquered much of Europe
6
Relating to the Middle Ages
7
Union formed for mutual benefit
9
Freedom from outside control
纵向
2
Deadly epidemic disease
4
Ancient Mesoamerican civilization
5
Long and distinct period of history
8
Exchange of goods between peoples
10
Large territory under one ruler
11
Fortified medieval residence
12
Armed entry into another territory