横向
1
Movement of people to new areas
5
Military blockade of a fortified place
6
Ancient empire that conquered much of Europe
8
Formal agreement between nations
10
Person who travels to discover new lands
纵向
2
Large territory under one ruler
3
Period of one hundred years
4
Alloy of copper and tin used in early tools
7
Payment made to show submission
9
Freedom from outside control
11
Government ruled by a king or queen
12
Fundamental law of a nation
13
Union formed for mutual benefit