横向
1
Person who buys and sells goods
6
Movement of people to new areas
7
Exchange of goods between peoples
8
Armed conflict between nations
9
Government ruled by a king or queen
10
Advanced stage of human society
11
Metal that replaced bronze in tools
纵向
2
Long and distinct period of history
3
Armed entry into another territory
4
Armored warrior of medieval times
5
Freedom from outside control