機器
build
bulldozer
cement
city
concrete
connection
construction
construction site
cover
development
dig
dirty
ditch
drain
drainage
engineering
equipment
grunge
hole
industrial
industry
infrastructure
iron
irrigation
manhole
manufacturing
metal
pavement
pipe
pipeline
plumbing
repair
road
rough
rusty
sewage
sewer
sewer line
site
soil
steel
street
system
technology
tube
underground
waste
water
work
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