横向
1
Large territory under one ruler
4
Armed conflict between nations
6
Government elected by the people
7
Succession of rulers from same family
8
Deadly epidemic disease
纵向
2
Period of ten years
3
Medieval land-for-service system
5
Roman arena fighter
9
Alloy of copper and tin used in early tools
10
Sudden overthrow of a government
11
Advanced stage of human society
12
Fortified medieval residence