機器
abstract
background
bolt
circle
clock
clockwork
closeup
cog
cogs
design
detail
engine
engineering
equipment
gear
gears
hardware
heavy
industrial
industry
iron
machinery
mechanical
mechanism
metal
metallic
old
part
repair
retro
round
rust
rusty
screw
set
small
spare
steel
teamwork
technical
technology
texture
vintage
watch
wheel
work