英文關鍵字
carbon
circular
close
construction
durable
elements
engineering
equipment
factory
ferrous
galvanize
galvanized
gray
group
heap
heavy
industrial
industry
iron
manufacture
material
metal
metallic
new
objects
part
pile
pipe
pipeline
pipes
plant
profile
rod
rough
round
row
rust
seamless
shelf
stack
steel
stock
storehouse
structure
technology
texture
tube
tubing
warehouse
welded