機器
3d
auto
automobile
automotive
car
cog
crank
crankshaft
cylinder
diesel
element
energy
engine
engineering
equipment
fuel
gear
gearbox
industrial
industry
iron
mechanic
mechanical
mechanism
metal
metallic
motion
motor
part
piston
plunger
polished
power
repair
ring
rod
rotation
service
shiny
speed
steel
technology
track
transport
transportation
valve
vehicle
white