機器
abandon
abandoned
abstract
age
aged
backdrop
background
circle
closeup
cogwheel
corrosion
damaged
design
detail
dirty
engine
factory
gear
gearing
industrial
industry
iron
machinery
material
mechanical
mechanism
metal
metallic
mills
old
oxidation
pattern
plant
retro
rough
round
rust
rusty
scene
steel
structure
surface
texture
vintage
wheel