機器
3d illustration
accessory
alloy
auto
automobile
automotive
cam
car
combustion
crank
crankshaft
cylinder
drive
engine
fuel
gear
industry
machining
manufacture
mechanic
mechanical
metal
motor
oil
outline
part
piston
power
race
ring
rod
shaft
shiny
sketch
speed
sport
steel
stroke
technical
technology
tools
transportation
truck
valve
vehicle
wireframe