機器
activity
backhoe
boom
bucket
building
bulldozer
civil
concrete
construction
crawler
danger
demolition
destroy
devastation
digger
disassemble
dismantling
dust
earth
earthwork
equipment
excavation
excavator
factory
field
heavy
hydraulic
industrial
industry
machinery
massive
material
mover
moving
power
quarry
reinforced
responsibility
ruin
shatter
shovel
site
sky
structure
technology
tracktype
tractor
vehicle
work