横向
1
Metal that replaced bronze in tools
2
Period of ten years
4
Advanced stage of human society
5
Period of one hundred years
6
Union formed for mutual benefit
10
Sudden overthrow of a government
纵向
2
Government by the people
3
Armed conflict between nations
7
Succession of rulers from same family
8
Practice of farming and growing food
9
Fortified medieval residence
11
Fundamental law of a nation