英文關鍵字
agriculture
alternative
bark
big
bole
branch
brown
business
chain
chile
chop
chopping
circle
clearing
commodity
coniferous
construction
cross
cultivated
cut
cylinder
cylindrical
day
deforestation
destruction
driver
driving
ecology
energy
environment
equipment
falling
firewood
forest
forester
forestry
fuel
gathering
green
growth
harvest
harvester
harvesting
heap
heavy
industrial