英文關鍵字
active
adolescent
athlete
athletic
blue
boy
caucasian
champion
dangerous
equipment
extreme
fun
health
helmet
hobby
kid
kneecaps
leisure
lifestyle
motivation
outdoor
park
people
practice
protection
protective
ramp
recreation
roller
rollerblade
rollerblader
schoolboy
sit
sitting
skate
skater
small
smiling
speed
sport
sporty
training
waiting
yellow