機器
blue
build
building
business
cement
clouds
commercial
concrete
construction
container
conveyor
day
dirty
dust
engineering
environment
equipment
facility
factory
gravel
heavy
industrial
industry
machinery
manufacture
manufacturing
metal
mixing
plant
pollution
pour
process
processing
produce
production
rock
sand
site
sky
steel
stone
storage
structure
tank
technology
tower
view
work