横向
1
Cold treeless Arctic plain
5
Flat elevated area of land
6
Total number of people in an area
8
Large body of water partly enclosed by land
9
Height above sea level
纵向
2
Goods sold to another country
3
Largest river in South America
4
Low-lying land surrounded by higher ground
7
Tool for finding directions
8
Large slow-moving mass of ice
10
Deep narrow valley with steep sides
11
Region between the two tropic lines
12
Goods brought in from another country