横向
1
Fundamental law of a nation
5
Armed conflict between nations
6
Long and distinct period of history
7
Ancient Mesoamerican civilization
8
Medieval land-for-service system
10
Relating to the Middle Ages
11
Belonging to a very old period
纵向
2
Advanced stage of human society
3
Person who buys and sells goods
4
Government by the people
9
Handwritten historical document
12
Object made by humans from the past