横向
1
Advanced stage of human society
6
Belonging to a very old period
7
Exchange of goods between peoples
8
Medieval land-for-service system
10
Practice of farming and growing food
纵向
1
Period of one hundred years
2
Practice of establishing foreign colonies
3
Large territory under one ruler
4
Roman arena fighter
5
Person who travels to discover new lands
9
Fundamental law of a nation
11
Sudden overthrow of a government