英文關鍵字
action
activity
bicycle
bike
biker
bmx
boy
boys
competition
control
cross
cycle
cycling
danger
exercise
extreme
fly
freestyle
fun
high
jump
male
men
motion
mountain
moving
mtb
park
pedal
people
performance
play
race
ride
riding
risk
skate
speed
sport
sports
street
stunt
tire
training
trick
urban
wheel
wheels
young