機器
architecture
block
blue
build
builder
business
cement
city
concrete
construct
construction
contractor
crane
development
engineer
engineering
equipment
estate
foreman
hardhat
helmet
high
house
industrial
industry
job
labor
machinery
men
metal
new
occupation
people
person
progress
project
real
safety
scaffolding
site
sky
steel
structure
urban
work
worker
yellow