横向
1
Practice of establishing foreign colonies
8
Government elected by the people
10
Person with no fixed home
11
Movement of people to new areas
12
Ancient empire that conquered much of Europe
纵向
2
Legislative body in ancient Rome
3
Long and distinct period of history
4
Large territory under one ruler
5
Period of ten years
6
Ancient Mesoamerican civilization
7
Fortified medieval residence
9
Advanced stage of human society