英文關鍵字
active
activity
adorable
adult
athletic
attentive
background
ball
big
caucasian
cheerful
coach
court
cute
equipment
exercise
fun
game
happiness
happy
healthy
inside
instructions
instructor
intensity
learning
leisure
lifestyle
male
man
outdoors
people
person
play
player
practice
racket
racquet
reaction
response
smiling
speed
sport
teaching
tennis
trainer
training
white
young
youth