機器
architecture
background
blue
build
builder
building
business
cement
concrete
construction
design
development
energy
engineer
engineering
environment
equipment
factory
heavy
helmet
industrial
industry
iron
job
machinery
man
manufacture
manufacturing
material
metal
people
person
plans
power
production
professional
safety
site
sky
steel
storage
structure
technology
times
tower
work
worker
working
workplace