機器
environmental
big
bridge
build
bulldozer
construct
construction
contractor
damage
destroy
destruction
dig
dirt
dredge
earth
earthmover
environment
equipment
excavator
flatten
heap
heavy
industrial
industry
job
labor
machinery
mover
operate
operator
power
progress
push
scoop
shovel
site
sunset
track
tractor
transport
truck
vehicle
wheel
window
work
yellow