横向
1
Armed conflict between nations
3
Union formed for mutual benefit
6
Payment made to show submission
7
Relating to the Middle Ages
8
Large territory under one ruler
9
Ancient empire that conquered much of Europe
10
Period of one hundred years
纵向
2
Metal that replaced bronze in tools
4
Exchange of goods between peoples
5
Person who travels to discover new lands
11
Belonging to a very old period