英文關鍵字
activity
background
big
bucket
building
bulldozer
business
caterpillar
close
commercial
construction
crawler
earth
earthmoving
engineering
equipment
excavation
excavator
ground
heavy
hydraulic
industrial
industry
loader
machine
machinery
mining
moving
orange
power
powerful
quarry
sand
shovel
site
technology
tractor
truck
vehicle
wheel
working