機器
abstract
aesthetic
background
black
bond
classic
closeup
cogs
cogwheel
concept
conceptual
connect
cross
cross section
crosssection
design
engine
engineering
factory
gearbox
gears
grey
industrial
industry
interlock
mechanical
mechanics
mechanism
metal
metallic
motion
motocross
motorcycle
parts
perfect
precious
precision
repair
rotate
service
shine
spares
steel
teamwork
teeth
wheel
wheels
white