横向
1
Person with no fixed home
4
Territory controlled by another country
7
Long and distinct period of history
8
Formal agreement between nations
9
Metal that replaced bronze in tools
11
Ancient empire that conquered much of Europe
12
Person who travels to discover new lands
纵向
2
Fortified medieval residence
3
Collection of traditional stories
5
Union formed for mutual benefit
6
Medieval land-for-service system
10
Advanced stage of human society