横向
1
Armed entry into another territory
4
Person who travels to discover new lands
5
Ancient empire that conquered much of Europe
6
Ancient Mesoamerican civilization
8
Payment made to show submission
纵向
2
Roman arena fighter
3
Sudden overthrow of a government
4
Large territory under one ruler
6
Collection of traditional stories
7
Armed conflict between nations
9
Metal that replaced bronze in tools