横向
1
Deep narrow valley with steep sides
3
Low area between mountains
5
Half of the Earth
6
Distance east or west of prime meridian
7
Cold treeless Arctic plain
13
Piece of land jutting into the sea
纵向
2
Wearing away of land by water or wind
4
Large slow-moving mass of ice
8
Vast body of salt water
9
Goods sold to another country
10
Dry land with little rainfall
11
Region between the two tropic lines
12
Ridge of rock or coral near the surface