英文關鍵字
air
asphalt
auto
automobile
blowing
bumper
car
carbon
cars
closeup
co2
combustible
condition
consumption
contaminant
contamination
contamineted
dirty
ecology
emission
energy
engine
environment
environmental
exaust
excursion
exhaust
fuel
gas
gasoline
gassed
iron
journey
metal
motor
nature
oil
oxygen
pipe
polluted
pollution
polution
power
rear
smog
smoke
tail
traffic
transportation
vehicle