機器
area
background
blank
blue
building
business
cement
clouds
concrete
construct
construction
dam
danger
dangerous
design
development
dirty
engineering
equipment
factory
floor
grey
ground
heavy
high
hole
industrial
industry
iron
job
low
material
metal
outdoor
piles
pillar
pole
road
site
sky
steel
strong
structure
technology
tower
view
white
work
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