横向
1
Goods sold to another country
3
Flat grassland in tropical regions
7
Tool for finding directions
9
Deep narrow valley with steep sides
10
Narrow sea inlet between cliffs
12
Largest river in South America
纵向
2
Height above sea level
4
Region surrounding the North Pole
5
Chain or group of islands
6
City that is seat of government
8
Large natural elevation of earth
11
Wearing away of land by water or wind