機器
abstract
alloy
aluminum
background
bolt
construction
design
dirty
engineering
equipment
factory
frame
gear
gray
grunge
industrial
industry
iron
machinery
machining
manufacturing
many
material
metal
metallic
metalwork
nobody
old
part
pattern
plate
production
retro
rough
rust
rusty
sheet
shiny
silver
spare
stainless
steel
surface
technology
texture
textured
tool
wall