機器
abstract
activity
architecture
background
bars
build
building
built
business
cement
characteristics
city
concrete
construct
construction
contruction
crane
design
development
element
engineering
equipment
frame
framework
heavy
house
industrial
industry
iron
large
material
mesh
metal
modern
new
reinforcement
rod
rusty
safety
site
steel
structure
technology
urban
why
work
worker
working