英文關鍵字
air
asphalt
auto
automobile
car
carbon
closeup
co2
detail
diesel
dioxide
dirty
ecology
emission
emit
engine
environment
environmental
exhaust
fuel
fume
fumes
gas
gasoline
industry
machine
muffler
old
output
outtake
pipe
poison
pollution
power
rev
road
smog
smoke
sound
tailpipe
technology
toxic
traffic
transportation
tube
vapor
vehicle
waste