機器
accuracy
background
ball
bearing
bearings
bright
car
chrome
chromed
circle
closeup
drive
engine
engineering
equipment
gear
industrial
industry
isolated
machinery
macro
material
mechanic
mechanical
mechanism
metal
metallic
motion
object
part
precision
ring
roller
rolling
round
service
shiny
silver
spare
sphere
steel
technical
technology
transportation
wheel
white
work