機器
afforestation
bulldozer
cleaning
climate
construction
deforestation
earth
ecological
economy
environment
environmental
equipment
excavation
excavator
forest
forestry
furrow plow
heavy
hole
hydraulic
industrial
industry
job
make
mechanical
mounding
natural
nature
offset shank
old
pit
power
problem
railway construction
remove
rise
roots
rural
scoop
soil
stumps
transportation
tree
trees
uproot
urbanization forestry
vehicle
works
yellow