横向
1
Movement of people to new areas
6
Medieval land-for-service system
7
Payment made to show submission
8
Union formed for mutual benefit
12
Roman arena fighter
13
Long and distinct period of history
14
Exchange of goods between peoples
纵向
2
Fortified medieval residence
3
Object made by humans from the past
4
Practice of farming and growing food
5
Succession of rulers from same family
9
Deadly epidemic disease
10
Period of one hundred years
11
Metal that replaced bronze in tools