横向
1
Distance north or south of equator
4
Region surrounding the North Pole
5
Low-lying land surrounded by higher ground
6
Largest river in South America
7
Ocean between Americas and Europe/Africa
纵向
2
Flat grassland in tropical regions
3
Largest ocean on Earth
8
Area where water covers the soil
9
Land surrounded by water on three sides
10
Low area between mountains