機器
age
aged
ancient
antique
background
business
circle
clock
clockwork
closeup
design
detail
dirty
engine
engineering
flow
gear
gears
grunge
industrial
industry
inside
iron
machinery
macro
many
mechanism
messy
metal
motion
old
part
parts
power
precision
repair
retro
rough
round
rusty
steel
technical
technology
turn
vintage
watch
wheel
work