機器
abandoned
building
building structure
casting
city
commercial
concrete
crane
dirty
economy
electricity
empty
energy
engineering
environment
equipment
factory
gantry
garbage
girder
hall
heavy
historical
hook
indoor
industrial
industrial building
interior
iron
iron frame
lift
light
load
machinery
manufacturing
metal
old
overhead
production
rope
station
steel
structure
tons
transportation
warehouse
weight
work
workshop