機器
automobile
automotive
belt
cam
camshaft
car
closeup
color
engine
engineering
equipment
gasoline
gear
head
inside
iron
machinery
mechanic
metal
metallic
motor
nobody
objects
oil
overhaul
part
pulley
repair
screw
selective focus
service
servicing
shaft
spring
stainless
steel
technology
transportation
valve
valve lifter
vehicle
work