英文關鍵字
architecture
armature
building
carcass
cementing
closeup
concrete
construct
construction
corrosion
design
equipment
fitting
fixtures
foundation
frame
framework
grid
hard
industrial
industry
iron
ironworks
line
material
metal
metallic
net
outdoor
outside
pattern
rail
reinforcement
reinforcing
rod
rusting
rusty
site
steel
strong
structure
texture
wire