機器
abandoned
abstract
agricultural
background
broken
brown
car
chain
circle
close
cog
color
decay
design
detail
dirty
drive
engine
engineering
equipment
factory
gear
grunge
industrial
industry
iron
machinery
mechanic
mechanical
mechanism
metal
metallic
object
paint
part
pattern
power
rust
rusted
rusty
steel
technology
texture
transportation
up
vehicle
wheel
white
work