英文關鍵字
asphalt
background
blacktop
build
caterpillar
close
close-up
closeup
concept
construction
crawl
crawler
dig
digging
dump
dumping
earthmover
earthwork
engineering
equipment
excavate
excavation
excavator
gravel
ground
heavy
highway
industrial
machine
machinery
maintenance
mechanical
mechanism
motorized
motorway
move
movement
moving
operation
part
pavement
paving
repair
road
roadway
roadwork
sand
shovel
site
soil
surface
track
truck
up
vehicle
view
work