横向
1
Largest river in South America
4
One of seven major landmasses
5
Total number of people in an area
7
Region surrounding the North Pole
9
Distance east or west of prime meridian
10
Steep rock face at edge of land
纵向
2
Seasonal heavy rainfall
3
Large natural elevation of earth
6
Large body of water partly enclosed by land
8
Goods brought in from another country
11
Cold treeless Arctic plain
12
Goods sold to another country
13
Flat grassland in tropical regions