英文關鍵字
alloy
architecture
bar
bars
base
bent
building
bundle
concrete
construct
construction
corrosive
engineering
equipment
fence
gray
group
heavy
industrial
industry
infrastructure
iron
line
lines
material
metal
metalic
outdoor
parallel
pile
rail
rebar
reinforced
resources
rigid
rod
rust
rusted
rusting
rusty
site
steel
strong
structure
texture