横向
1
Deep narrow valley with steep sides
4
Ridge of rock or coral near the surface
5
Vast body of salt water
8
Ocean between Americas and Europe/Africa
10
Flat elevated area of land
纵向
2
Goods sold to another country
3
Low-lying land surrounded by higher ground
6
Total number of people in an area
7
Where river meets the sea
9
Large slow-moving mass of ice