英文關鍵字
activity
backhoe
big
blue
bucket
build
bulldozer
construction
contractor
diesel
dig
dirt
dirty
earth
equipment
excavation
excavator
ground
heavy
hydraulic
industrial
industry
land
large
loader
machine
machinery
metal
mining
mover
outdoor
outdoors
power
road
sand
scoop
shovel
site
soil
steel
technology
tire
tractor
transport
transportation
vehicle
wheel
work
yellow