機器
abstract
auto
automobile
automotive
background
backgrounds
car
clean
closeup
cogwheel
complex
complexity
cross
crosssection
design
diesel
engine
engineering
equipment
gear
industrial
industry
innovation
inside
instrument
machinery
manifold
mechanical
mechanism
metal
metallic
motor
movement
new
part
power
precise
precision
robot
robotic
section
sophisticated
steel
teamwork
technology
transmission
transportation
turning
vehicle