横向
1
Formal agreement between nations
4
Metal that replaced bronze in tools
6
Freedom from outside control
8
Object made by humans from the past
9
Deadly epidemic disease
11
Government elected by the people
纵向
2
Handwritten historical document
3
Movement of people to new areas
5
Medieval religious military campaign
7
Period of one hundred years
10
Person who travels to discover new lands
12
Sudden overthrow of a government