横向
1
Formal agreement between nations
4
Advanced stage of human society
5
Union formed for mutual benefit
9
Deadly epidemic disease
12
Person who buys and sells goods
纵向
2
Ancient Mesoamerican civilization
3
Armored warrior of medieval times
6
Ancient Egyptian picture writing
7
Metal that replaced bronze in tools
8
Government by the people
10
Movement of people to new areas
11
Ancient Egyptian ruler
13
Alloy of copper and tin used in early tools