横向
1
Metal that replaced bronze in tools
4
Freedom from outside control
5
Belonging to a very old period
7
Exchange of goods between peoples
9
Practice of establishing foreign colonies
10
Government by the people
纵向
2
Large territory under one ruler
3
Government ruled by a king or queen
6
Medieval land-for-service system
8
Armed conflict between nations
11
Succession of rulers from same family