横向
1
Fundamental law of a nation
6
Medieval land-for-service system
7
Relating to the Middle Ages
8
Practice of farming and growing food
9
Movement of people to new areas
11
Military blockade of a fortified place
纵向
2
Ancient empire that conquered much of Europe
3
Large territory under one ruler
4
Formal agreement between nations
5
Advanced stage of human society
10
Uprising against authority