横向
1
Alloy of copper and tin used in early tools
3
Territory controlled by another country
4
Person who travels to discover new lands
5
Person with no fixed home
6
Freedom from outside control
11
Advanced stage of human society
纵向
2
Practice of establishing foreign colonies
7
Exchange of goods between peoples
8
Government ruled by a king or queen
9
Fortified medieval residence
10
Period of one hundred years
12
Male monarch ruler
13
Period of ten years
14
Metal that replaced bronze in tools