機器
auto
automobile
background
car
chain
clean
close
cogs
combustion
compression
detail
details
diesel
energy
engine
exposed
fuel
gas
gear
industrial
industry
injection
internal
mechanic
mechanical
metal
metallic
modern
motor
move
new
oil
parts
petroleum
piston
polished
power
powerful
precision
repair
rims
rotor
shiny
spare
steel
technology
transportation
valve
vehicle