横向
1
Alloy of copper and tin used in early tools
2
Territory controlled by another country
3
Metal that replaced bronze in tools
5
Male monarch ruler
7
Fortified medieval residence
8
Medieval land-for-service system
9
Exchange of goods between peoples
11
Union formed for mutual benefit
13
Formal agreement between nations
纵向
2
Advanced stage of human society
4
Person who travels to discover new lands
6
Government elected by the people
10
Handwritten historical document
12
Sudden overthrow of a government