英文關鍵字
adolescent
athlete
athletic
blue
boy
cardio
caucasian
champion
confident
dangerous
development
equipment
extreme
fun
gathering
health
helmet
hobby
kid
kneecaps
leisure
lifestyle
momentum
outdoor
park
people
practice
protection
recreation
roller
rollerblades
rollerblading
run
schoolboy
skating
skill
speed
sports
sportsman
strength
summer
training
trick
yellow
young