英文關鍵字
alloy
aluminium
aluminum
architecture
background
bar
bird
black
building
chrome
closeup
construction
design
element
engineering
extrusion
factory
frame
house
industrial
industry
iron
isolated
line
machine
macro
manufacturing
materials
metal
metallic
objects
pipe
pipeline
product
production
profile
shape
shiny
silver
site
stack
stainless
steel
structural
structure
tube
tubing
view
warehouse
window