横向
1
Long and distinct period of history
3
Metal that replaced bronze in tools
4
Territory controlled by another country
6
Exchange of goods between peoples
10
Relating to the Middle Ages
11
Succession of rulers from same family
12
Large territory under one ruler
纵向
2
Practice of establishing foreign colonies
5
Legislative body in ancient Rome
7
Deadly epidemic disease
8
Union formed for mutual benefit
9
Belonging to a very old period