機器
accuracy
auto
background
ball
bearing
bright
car
chrome
chromed
circle
closeup
construction
engine
engineering
industrial
industry
isolated
life
machinery
macro
material
mechanics
mechanism
metal
metallic
motion
motor
objects
parts
precision
ring
roller
rolling
round
service
silver
spare
sphere
steel
still
technical
technology
train
transportation
turning
vehicle
wheel
white
work