横向
1
Medieval land-for-service system
4
Movement of people to new areas
5
Government ruled by a king or queen
6
Metal that replaced bronze in tools
10
Male monarch ruler
11
Practice of farming and growing food
纵向
2
Legislative assembly of a country
3
Territory controlled by another country
7
Exchange of goods between peoples
8
Alloy of copper and tin used in early tools
9
Advanced stage of human society