横向
1
Formal agreement between nations
4
Metal that replaced bronze in tools
6
Legislative assembly of a country
7
Union formed for mutual benefit
8
Armored warrior of medieval times
9
Object made by humans from the past
纵向
2
Fundamental law of a nation
3
Alloy of copper and tin used in early tools
5
Ancient Mesoamerican civilization
10
Person who buys and sells goods