不要
abstract
air
aluminum
art
auto
automobile
backdrop
background
car
chrome
closeup
concept
condenser
condition
cooler
cooling
design
engine
equipment
exchanger
grid
grunge
hardware
heat
industry
iron
lattice
lines
material
mechanic
mesh
metal
old
part
pattern
radiator
regenerator
rusty
stainless
striped
surface
system
technology
temperature
texture
transportation
vehicle
vintage