機器
above
aerial
architect
architecture
beam
belt
builder
building
concrete
construction
construction sit
contractor
development
engineer
engineering
equipment
helmet
industrial
industry
inspection
iron
job
labor
laborer
man
material
metal
occupation
paint
people
professional
progress
project
safety
safety first
site
steel
structure
top
top view
under construction
view
warehouse
welding
work
worker
workers
working
workplace