横向
1
Cold treeless Arctic plain
4
Imaginary line around the middle of Earth
5
Region surrounding the North Pole
6
Large body of water partly enclosed by land
7
Mountain that can erupt with lava
12
Height above sea level
纵向
2
Ridge of rock or coral near the surface
3
Goods brought in from another country
8
Low-lying land surrounded by higher ground
9
Line dividing two countries
10
Flat grassland in tropical regions
11
Body of water surrounded by land