横向
1
Exchange of goods between peoples
4
Medieval land-for-service system
5
Formal agreement between nations
6
Territory controlled by another country
8
Person who travels to discover new lands
9
Deadly epidemic disease
纵向
1
Payment made to show submission
2
Armed conflict between nations
3
Military blockade of a fortified place
6
Advanced stage of human society
7
Freedom from outside control
10
Collection of traditional stories