英文關鍵字
area
building
bulldozer
business
caterpillar
chassis
construct
construction
crawler
digger
dirt
dirty
earth
earthmover
engineering
equipment
excavator
ground
heavy
hydraulic
industrial
industry
loader
machine
machinery
metal
mining
moving
parts
preparing
quarry
sand
site
soil
steel
technology
tractor
transportation
truck
vehicle
wheel
working
yellow