機器
abandoned
abstract
antique
background
big
brown
cog
cogs
cogwheel
design
dragline
engine
engineering
equipment
factory
gear
gears
heavy
huge
industrial
industry
iron
large
light
machinery
machines
mechanical
mechanism
mechanisms
metal
motor
old
pattern
power
retro
round
rural
rust
rusty
steel
technology
teeth
vintage
walking
wheel
white
work