英文關鍵字
asphalt
automobile
border
carriageway
cars
civilization
crossing
crosswalk
danger
day
daylight
drove
edge
fluff
fly
footway
high
lattice
lines
machine
motion
outdoor
passed
pavement
pedestrian
ride
road
shadows
side
sidewalk
speed
steps
stone
street
striped
summer
sunlight
sunny
swath
urban
wheels
zebra