英文關鍵字
above
aerial
barrow
bird
blue
brown
clay
construction
deforestation
delf
delft
devastated
development
earth
earthen
environment
equipment
europe
european
excavator
extraction
eye
field
ground
heavy
industrial
industry
kaolinite
landscape
mine
minerals
open
outdoor
output
picking
pit
production
productivity
quarry
quarrying
soil
strip
technology
texture
top
toxic
truck
union
view
work
yellow