横向
1
Alloy of copper and tin used in early tools
5
Person who travels to discover new lands
6
Person with no fixed home
10
Metal that replaced bronze in tools
11
Payment made to show submission
12
Advanced stage of human society
纵向
2
Person owned as property
3
Medieval religious military campaign
4
Belonging to a very old period
7
Male monarch ruler
8
Union formed for mutual benefit
9
Ancient Mesoamerican civilization
13
Formal agreement between nations