横向
1
Region surrounding the North Pole
5
Goods sold to another country
8
Low area between mountains
9
Ocean between Americas and Europe/Africa
11
Flat grassland in tropical regions
纵向
2
Deep narrow valley with steep sides
3
Largest ocean on Earth
4
Vast body of salt water
6
Region between the two tropic lines
7
Cold treeless Arctic plain
10
Tool for finding directions