横向
1
Union formed for mutual benefit
7
Practice of farming and growing food
8
Movement of people to new areas
9
Long and distinct period of history
11
Metal that replaced bronze in tools
12
Military blockade of a fortified place
纵向
2
Advanced stage of human society
3
Person who travels to discover new lands
4
Deadly epidemic disease
5
Military conflict or fight
6
Fortified medieval residence
10
Handwritten historical document