横向
1
Government by the people
4
Military conflict or fight
8
Ancient Egyptian ruler
9
Government ruled by a king or queen
12
Exchange of goods between peoples
纵向
2
Medieval land-for-service system
3
Armed conflict between nations
5
Person with no fixed home
6
Sudden overthrow of a government
7
Ancient Mesoamerican civilization
8
Deadly epidemic disease
10
Union formed for mutual benefit
11
Medieval religious military campaign