英文關鍵字
abstract
aluminum
architecture
background
building
bunch
circle
construction
cylinder
empty
engineering
equipment
factory
group
heap
heavy
industrial
industry
interior
iron
manufacture
manufacturing
material
metal
metallic
metalpipe
metalpipes
objects
old
pattern
pipe
pipeline
pipes
plant
rod
round
rust
stack
stainless
steel
stock
storage
storehouse
structure
technology
warehouse