機器
abstract
aged
automobile
background
block
car
component
components
concept
connection
detail
diesel
dirty
energy
engine
filter
gas
generator
grease
greasy
grime
grimy
grungy
horse
industry
iron
machinery
mechanic
mechanical
messy
metal
motor
oil
oily
old
parts
pipe
pipes
piston
power
steel
system
truck
tube
valve
vehicle