英文關鍵字
bulldozer
industry
machinery
earth
construction
equipment
heavy
shoveling
vehicle
work
yellow
power
dirt
site
mover
tractor
dig
excavation
hydraulic
truck
sand
loader
scoop
ground
wheel
land
earthmover
development
technology
contractor
mining
engineering
build
gravel
transport
soil
action
business
duty
job
diesel
steel
tool
mechanism
ecology