英文關鍵字
agricultural
and
animals
background
broken
change
climate
corn
czech
danger
death
degradation
desert
desertification
desiccation
dirt
dirty
disaster
drought
dry
drying
earth
ecology
environment
environmental
europe
field
for
geology
ground
land
leaf
maize
mays
mud
nature
plant
plants
problem
republic
rough
set
soil
summer
surface
up
very
zea