機器
alloy
automotive
background
ball
bearing
car
chrome
conveyor
curve
cylindrical
engine
engineer
engineering
equipment
gear
heavy
industrial
industry
isolated
kinematics
lubrication
machinery
macro
mechanic
metal
motion
object
part
pivot
reflection
repairing
roller bearing
service
shiny
silver
single
spare
sphere
steel
steering
studio
tapered
technology
tool
transportation
turning
vehicle
wheel
white