機器
abstract
auto
automobile
backdrop
background
binding
black
bond
business
car
classic
closeup
cogs
cogwheel
concept
conceptual
connect
cooperation
design
engine
engineering
equipment
factory
gear
gearbox
gears
industrial
industry
interlock
machinery
macro
mechanic
mechanical
mechanics
mechanism
metal
metallic
motor
part
precision
repair
steel
teamwork
technology
teeth
transmission
vehicle
wheel
work