機器
accuracy
background
ball
ball bearing
bearing
business
car
chrome
circle
closeup
concept
conceptual
constructing
detail
device
engine
engineering
equipment
factory
gear
gearing
industrial
industry
iron
job
machinery
macro
mechanical
mechanics
mechanism
metal
metallic
motor
movement
occupation
part
plant
repair
rolling
spare
steel
technology
texture
tool
vehicle
wheel
workshop