英文關鍵字
abstract
aluminum
backgrounds
business
chrome
circle
cylinder
duct
engineering
equipment
futuristic
gas
group
industrial
industry
iron
item
manufacture
material
metal
metallic
metalworks
new
nobody
objects
oil
parts
perspective
pipe
pipeline
piping
production
row
science
stack
stainless
steel
technology
trunk
tube
warehouse
water
workpiece