機器
abstract
auto
automobile
automotive
background
camshaft
car
closeup
combustion
cylinder
detail
disassembled
dohc
engine
engineering
equipment
factory
gear
glass
industrial
industry
internal
machinery
machining
macro
mechanic
metal
metallic
motor
object
part
performance
piston
pollution
precision
racing
rebuild
reflection
repair
service
showcase
spare
steel
technology
transportation
tuning
valve
vehicle