英文關鍵字
air
asphalt
atmosphere
auto
automobile
car
carbon
co2
damage
danger
detail
diesel
dioxide
dirty
driving
ecology
emission
energy
environment
environmental
exhaust
fuels
fumes
gas
gasoline
grey
industry
machine
monoxide
outtake
petrol
pipe
pollutant
pollute
power
rattle
road
smog
smoke
sound
toxic
transportation
truck
vapor
vehicle