英文關鍵字
car
exhaust
environment
pipe
pollution
gas
road
air
smoke
transport
traffic
gasoline
vehicle
dirty
engine
emissions
atmosphere
ecology
auto
industry
toxic
power
monoxide
dioxide
carbon
fuel
smog
effect
combustion
muffler
health
black
waste
blow
wheel
danger
polluted
gray
co2
technology
energy
oxide
hydrocarbon
accumulation
concentration
poisoning
diesel
soot
influence
dark