機器
accuracy
closeup
cog
cogs
cogwheel
design
detail
dirty
engine
engineering
equipment
gear
gearwheel
grunge
grungy
heavy
industrial
industry
instrument
iron
machinery
mechanical
mechanics
mechanism
metal
metallic
obsolete
old
part
power
precise
precision
retro
round
rust
rusty
sprockets
steel
strong
surface
technical
technology
vintage