機器
activity
architecture
asian
build
builder
building
cement
concrete
construct
construction
contractor
crane
create
derrick
development
engineering
equipment
foundation
hard
heavy
high
human
industrial
industry
infrastructure
iron
job
labor
laborer
man
material
mixer
people
pillar
pouring
profession
project
reinforcement
rod
safety
site
skill
steel
strength
structure
urban
worker
working