横向
1
Exchange of goods between peoples
3
Armed conflict between nations
4
Person who travels to discover new lands
5
Territory controlled by another country
8
Succession of rulers from same family
9
Formal agreement between nations
10
Movement of people to new areas
纵向
2
Ancient Mesoamerican civilization
4
Large territory under one ruler
5
Advanced stage of human society
6
Period of ten years
7
Belonging to a very old period