横向
1
Relating to the Middle Ages
5
Succession of rulers from same family
6
Large territory under one ruler
7
Payment made to show submission
8
Exchange of goods between peoples
9
Period of ten years
10
Medieval land-for-service system
12
Government ruled by a king or queen
纵向
2
Belonging to a very old period
3
Government by the people
4
Government elected by the people
11
Person owned as property