英文關鍵字
pollution
traffic
road
transportation
transport
urban
motion
drive
city
congestion
car
speed
slow
automobile
outside
way
street
highway
transit
overhead
expressway
vehicle
modern
aerial
auto
fuel
intersection
daytime
high
英文關鍵字
pollution
traffic
road
transportation
transport
urban
motion
drive
city
congestion
car
speed
slow
automobile
outside
way
street
highway
transit
overhead
expressway
vehicle
modern
aerial
auto
fuel
intersection
daytime
high