横向
1
Formal agreement between nations
5
Advanced stage of human society
6
Movement of people to new areas
8
Government elected by the people
9
Union formed for mutual benefit
10
Period of one hundred years
12
Deadly epidemic disease
13
Military conflict or fight
14
Succession of rulers from same family
纵向
2
Period of ten years
3
Legislative assembly of a country
4
Person who buys and sells goods
7
Armored warrior of medieval times
11
Government ruled by a king or queen
15
Exchange of goods between peoples