横向
1
Person who travels to discover new lands
5
Succession of rulers from same family
6
Freedom from outside control
7
Formal agreement between nations
9
Long and distinct period of history
10
Ancient Mesoamerican civilization
11
Period of one hundred years
纵向
2
Person owned as property
3
Roman arena fighter
4
Large territory under one ruler
8
Military blockade of a fortified place
12
Ancient empire that conquered much of Europe
13
Legislative assembly of a country