横向
1
Practice of establishing foreign colonies
7
Formal agreement between nations
9
Medieval land-for-service system
12
Freedom from outside control
纵向
2
Government by the people
3
Belonging to a very old period
4
Territory controlled by another country
5
Advanced stage of human society
6
Handwritten historical document
8
Person who travels to discover new lands
10
Ancient empire that conquered much of Europe
11
Fortified medieval residence