機器
aged
aluminium
background
bolt
bunch
chain
circle
closeup
cog
copper
design
detail
dirty
element
engineering
equipment
gear
gray
heap
industrial
industry
iron
machinery
many
mechanic
mechanism
metal
metallic
part
pattern
pile
power
punk
repair
retro
rivet
rust
rusty
screw
shine
steam
steel
texture
tool
trash
vintage
weathered
wheel
wires