横向
1
Goods sold to another country
3
Largest hot desert in the world
4
Land surrounded by water on three sides
5
Goods brought in from another country
7
Large area covered with trees
11
One of seven major landmasses
纵向
1
Imaginary line around the middle of Earth
2
Largest river in South America
6
Region between the two tropic lines
8
Largest ocean on Earth
9
Total number of people in an area
10
Ridge of rock or coral near the surface
12
Mountain that can erupt with lava