the boundary between land and water, particularly as seen on a map or from above
海岸线
related to the study or characteristics of the Earth's surface, including its features, landscapes, and locations
地理的
a valley that is deep and has very steep sides, through which a river is flowing usually
峡谷
a hypothetical line around the Earth that divides it into Northern and Southern hemispheres
赤道
(geology) a body of rock with a particular set of characteristics that make it distinct from the surrounding land
地层
a large mass of ice that forms over long periods of time, especially in polar regions or high mountains
冰川
associated with or characteristic of the tropics, regions of the Earth near the equator known for their warm climate and lush vegetation
热带的
the distance of a point east or west of the meridian at Greenwich that is measured in degrees
经度
having had an altered genetic structure in order to serve a particular purpose, such as being more resistant to disease, bearing more fruit, etc.
基因改造的