横向
1
Territory controlled by another country
3
Government by the people
4
Union formed for mutual benefit
5
Military blockade of a fortified place
6
Practice of establishing foreign colonies
7
Armed conflict between nations
8
Belonging to a very old period
9
Payment made to show submission
纵向
2
Advanced stage of human society
3
Succession of rulers from same family
8
Object made by humans from the past
10
Deadly epidemic disease
11
Period of ten years