横向
1
Goods sold to another country
3
Low-lying land surrounded by higher ground
5
Large natural stream of water
7
Largest river in South America
9
Body of water surrounded by land
10
Total number of people in an area
11
Steep rock face at edge of land
纵向
2
Deep narrow valley with steep sides
4
Chain or group of islands
6
Largest ocean on Earth
8
Goods brought in from another country