横向
1
Flat grassland in tropical regions
3
Region near the equator
3
Region between the two tropic lines
5
Goods sold to another country
6
Line dividing two countries
7
Long-term weather patterns of an area
14
Goods brought in from another country
纵向
2
Large natural stream of water
4
Total number of people in an area
8
Chain or group of islands
9
Cold treeless Arctic plain
10
Area where water covers the soil
11
Large area covered with trees
12
Largest ocean on Earth
13
Land surrounded by water on three sides