横向
1
Practice of establishing foreign colonies
5
Armed conflict between nations
6
Roman arena fighter
8
Medieval land-for-service system
9
Person owned as property
11
Exchange of goods between peoples
纵向
2
Ancient empire that conquered much of Europe
3
Medieval religious military campaign
4
Practice of farming and growing food
7
Person with no fixed home
10
Advanced stage of human society
12
Sudden overthrow of a government