横向
1
Long and distinct period of history
3
Relating to the Middle Ages
4
Exchange of goods between peoples
6
Metal that replaced bronze in tools
8
Freedom from outside control
纵向
1
Large territory under one ruler
2
Armed entry into another territory
5
Legislative assembly of a country
7
Practice of establishing foreign colonies
9
Succession of rulers from same family
10
Military blockade of a fortified place
11
Ancient empire that conquered much of Europe