横向
1
Freedom from outside control
8
Union formed for mutual benefit
9
Succession of rulers from same family
10
Government ruled by a king or queen
11
Metal that replaced bronze in tools
纵向
2
Medieval land-for-service system
3
Long and distinct period of history
4
Period of one hundred years
5
Practice of farming and growing food
6
Payment made to show submission
7
Movement of people to new areas