英文關鍵字
absorb
absorbed
absorption
abstract
africa
arabia
arid
background
because
brown
climate
concept
conceptual
conservation
copy
copyspace
dead
desert
disappear
disappearing
disaster
drop
drought
droughty
dry
drying
earth
ecology
empty
environment
environmental
evaporate
evaporating
geology
global
h2o
heat
hot
land
last
lifelessness
nature
pool
price
puddle
quickly
resources
safari
sahara
sand
save
saving
season
shortage
small
soak
soil
space
surface
survival
the
thirst
vanish
vanishing
vaporize
water
waterhole
weather
yellow