横向
1
Flat elevated area of land
4
Physical features of land
5
Body of water surrounded by land
7
Goods sold to another country
8
Ridge of rock or coral near the surface
纵向
1
Largest ocean on Earth
2
Line dividing two countries
3
Flat grassland in tropical regions
4
Cold treeless Arctic plain
6
Large natural stream of water
9
Largest river in South America