英文關鍵字
air
atmosphere
auto
automobile
beams
blowing
car
carbon
co2
combustion
congestion
consumption
damage
danger
detail
dioxide
dirty
eco
ecology
emissions
engine
environment
exhaust
fuel
fumes
gas
gasoline
gray
hot
industry
mechanics
metal
muffler
oil
oxide
painting
pipe
poison
pollution
power
puttingtying
remove
road
rust
sills
smog
smoke
speed
steam
strengthen
structure
technology
toxic
traffic
transport
vehicle
waste
welding
wheel