横向
1
Ancient empire that conquered much of Europe
4
Advanced stage of human society
5
Alloy of copper and tin used in early tools
6
Practice of establishing foreign colonies
10
Medieval religious military campaign
14
Movement of people to new areas
纵向
2
Period of ten years
3
Armed entry into another territory
7
Long and distinct period of history
8
Medieval land-for-service system
9
Military blockade of a fortified place
11
Ancient Mesoamerican civilization
12
Ancient Egyptian stone monument
13
Succession of rulers from same family
15
Object made by humans from the past