横向
1
Line dividing two countries
3
Ocean between Americas and Europe/Africa
5
Seasonal heavy rainfall
7
Land surrounded by water on three sides
8
Flat elevated area of land
11
Flat grassland in tropical regions
纵向
2
Goods sold to another country
4
Tool for finding directions
6
Large natural stream of water
9
Landform where river meets the sea
10
Largest river in South America