機器
3d
abstract
background
business
circle
city
cogs
cogwheel
concept
conceptual
connect
connection
cooperation
element
engine
engineering
equipment
front
frontview
gear
group
illustration
industrial
industry
light
machinery
mechanical
mechanics
mechanism
metal
metallic
nobody
organization
power
precision
render
rendering
silver
steel
surface
symbol
team
teamwork
technical
technology
view
wheel
wooden
work