機器
accuracy
background
bearing
brass
chrome
circle
closeup
components
conic
crosssection
cylinder
detail
engineering
equipment
friction
gear
grease
industrial
industry
machinery
macro
mechanic
mechanical
mechanics
mechanism
metal
metallic
nobody
object
part
precise
precision
ring
roll
roller
rollerbearing
rolling
round
separator
shaft
shiny
silver
stainless
steel
technical
technology
wheel