機器
ancient
antique
background
black
business
circle
classic
design
detail
engine
engineering
equipment
flow
gear
grunge
history
industrial
industry
instrument
iron
isolated
machinery
macro
mechanical
mechanism
metal
metallic
motion
object
obsolete
old
oldfashioned
part
power
retro
rusty
steel
style
technical
technology
tool
vintage
wheel
white
work