横向
1
Cold treeless Arctic plain
4
Goods sold to another country
5
Large natural stream of water
9
Deep narrow valley with steep sides
纵向
2
Goods brought in from another country
3
Vast body of salt water
4
Imaginary line around the middle of Earth
6
Ocean between Americas and Europe/Africa
7
Area where water covers the soil
8
Narrow sea inlet between cliffs