横向
1
Chain or group of islands
5
Large natural stream of water
7
Flat grassland in tropical regions
8
Cold treeless Arctic plain
9
Large natural elevation of earth
纵向
2
Deep narrow valley with steep sides
3
Visual representation of an area
4
Total number of people in an area
6
One of seven major landmasses
10
Half of the Earth
11
Land surrounded by water
12
Large area covered with trees