機器
asphalt
auto
automobile
automotive
background
black
car
change
chemical
closeup
color
crisis
crude
damage
danger
dirty
drain
drop
engine
environment
flow
fuel
garage
gasoline
industrial
industry
leak
liquid
maintenance
mechanical
metal
motor
oil
old
petroleum
pollution
power
repair
road
service
spill
stain
street
transportation
used
vehicle
wet