横向
1
Steep rock face at edge of land
3
Region near the equator
4
Seasonal heavy rainfall
8
Large natural stream of water
10
Largest river in South America
纵向
2
Land surrounded by water
4
Large natural elevation of earth
5
Goods sold to another country
6
Ridge of rock or coral near the surface
7
Wearing away of land by water or wind
9
Low-lying land surrounded by higher ground