横向
1
Practice of establishing foreign colonies
6
Person who travels to discover new lands
7
Person owned as property
8
Military conflict or fight
10
Belonging to a very old period
12
Metal that replaced bronze in tools
纵向
2
Ancient empire that conquered much of Europe
3
Armed conflict between nations
4
Person with no fixed home
5
Advanced stage of human society
9
Medieval land-for-service system
11
Period of one hundred years