英文關鍵字
acceleration
bike
biker
black
brake
caucasian
city
colourful
cyclist
danger
darkness
engine
guy
helmet
human
illuminate
illuminated
lit
man
motion
motor
motorbike
motorcycle
night
pole
power
protection
ride
rider
road
speed
sport
steer
street
streetlight
traffic
transport
transportation
travel
trip
vehicle
wheel