英文關鍵字
activity
adolescent
bicycle
bicycling
bike
biker
boy
caucasian
cheerful
child
childhood
cute
cycle
cyclist
day
driving
enjoyment
equipment
exercise
foot
fun
grass
happy
healthy
hobby
kid
lane
leisure
lifestyle
looking
motion
one
outdoor
park
person
pedal
preschooler
recreation
road
rural
safety
shoes
schoolboy
sport
summer
years
young
wide
wideangle
gopro