横向
1
Low-lying land surrounded by higher ground
3
Ridge of rock or coral near the surface
5
Cold treeless Arctic plain
6
Goods brought in from another country
11
Land surrounded by water
纵向
2
Where river meets the sea
4
Distance east or west of prime meridian
7
Line dividing two countries
8
Body of water surrounded by land
9
Ocean between Americas and Europe/Africa
10
Dry land with little rainfall
12
Half of the Earth