横向
1
Large natural stream of water
4
Vast body of salt water
5
One of seven major landmasses
7
Largest ocean on Earth
10
Area where water covers the soil
12
Flat grassland in tropical regions
纵向
2
City that is seat of government
3
Goods sold to another country
6
Low area between mountains
8
Land surrounded by water
9
Region surrounding the North Pole
11
Mountain that can erupt with lava
13
Region near the equator