横向
1
Cold treeless Arctic plain
4
Largest ocean on Earth
5
Largest hot desert in the world
7
Area where water covers the soil
8
Land surrounded by water on three sides
纵向
2
Ocean between Americas and Europe/Africa
3
Region between the two tropic lines
6
Flat grassland in tropical regions
9
Flat elevated area of land
10
Largest river in South America