機器
bucket
build
bulldozer
construction
development
digger
dirt
dug
engineering
environment
equipment
excavation
excavator
grader
gravel
ground
heavy
hired
hydraulic
industrial
industry
labour
land
loader
machinery
mining
move
mover
pit
power
quarry
road
sand
sandpit
scoop
shovel
site
sky
soil
special
stone
tractor
transport
transportation
vehicle
work
yellow