横向
1
Deep narrow valley with steep sides
5
Cold treeless Arctic plain
7
Ridge of rock or coral near the surface
10
Flat grassland in tropical regions
12
Land surrounded by water on three sides
纵向
2
Narrow sea inlet between cliffs
3
Seasonal heavy rainfall
4
Mountain that can erupt with lava
6
Goods sold to another country
8
One of seven major landmasses
9
Large body of water partly enclosed by land
11
Wearing away of land by water or wind