英文關鍵字
adolescent
athlete
athletic
blue
boy
career
caucasian
champion
cheer
development
encourage
encouragement
equipment
extreme
family
fan
fun
greeting
health
helmet
hobby
kid
kneecaps
leisure
mom
mother
outdoor
park
people
practice
protection
proud
ramp
recreation
roller
rollerblader
rollerblading
rolling
son
sport
summer
support
training
winner