横向
1
Military blockade of a fortified place
4
Person with no fixed home
5
Medieval land-for-service system
6
Alloy of copper and tin used in early tools
8
Advanced stage of human society
10
Practice of farming and growing food
12
Person who buys and sells goods
13
Ancient Mesoamerican civilization
纵向
2
Large territory under one ruler
3
Ancient empire that conquered much of Europe
7
Ancient Egyptian picture writing
9
Union formed for mutual benefit
11
Metal that replaced bronze in tools