横向
1
Large area covered with trees
3
Deep narrow valley with steep sides
7
Large natural elevation of earth
8
Goods sold to another country
9
Mountain that can erupt with lava
11
Ridge of rock or coral near the surface
纵向
2
Wearing away of land by water or wind
4
Line dividing two countries
5
Land surrounded by water on three sides
6
Cold treeless Arctic plain
10
Goods brought in from another country