横向
1
Area where water covers the soil
4
Long-term weather patterns of an area
5
Large natural stream of water
6
Land surrounded by water
7
Land surrounded by water on three sides
纵向
2
Wearing away of land by water or wind
3
Goods sold to another country
4
One of seven major landmasses
8
Vast body of salt water
9
Flat grassland in tropical regions