横向
1
Ancient empire that conquered much of Europe
4
Person with no fixed home
5
Exchange of goods between peoples
6
Roman arena fighter
7
Succession of rulers from same family
10
Government ruled by a king or queen
11
Period of ten years
12
Military blockade of a fortified place
纵向
2
Long and distinct period of history
3
Freedom from outside control
8
Advanced stage of human society
9
Armed entry into another territory
13
Person who travels to discover new lands