英文關鍵字
air
atmosphere
auto
automobile
blowing
building
car
carbon
city
co2
combustion
congestion
consumption
damage
danger
detail
dioxide
dirty
eco
ecology
emissions
engine
environment
exhaust
fuel
fumes
gas
gasoline
gray
harmful
hot
industry
internet
mechanics
mobile
muffler
oil
oxide
passenger
pipe
poison
pollution
power
road
roof
smog
smoke
speed
steam
technology
towers
toxic
traffic
transport
vehicle
waste
wheel