横向
1
Payment made to show submission
4
Medieval land-for-service system
5
Person with no fixed home
6
Metal that replaced bronze in tools
7
Period of one hundred years
8
Person owned as property
9
Male monarch ruler
纵向
2
Government elected by the people
3
Advanced stage of human society
10
Ancient Mesoamerican civilization
11
Deadly epidemic disease
12
Handwritten historical document