機器
environmental
borrow
bucket
build
bulldozer
business
caterpillar
construction
construction area
construction site
crane
deforestation
demolition
destruction
development
dig
digger
dirt
earth
ecology
engineering
environment
equipment
excavate
excavation
excavator
grass
ground
heavy
industrial
industry
loader
mine
nature
old
quarry
resources
shovel
soil
sustainability
sustainable
tool
unused
work