機器
architect
architecture
background
builder
building
business
cement
concrete
construct
construction
construction site
contractor
crane
engineer
engineering
estate
factory
fire
formwork
foundation
framework
helmet
industry
iron
man
manual
manufacture
manufacturing
material
metalwork
people
power
professional
project
protection
reinforcement
rod
safety
scaffolding
smoke
spark
steel
structure
tool
weld
welder
welding
work
worker