英文關鍵字
action
active
activity
adult
adventure
athlete
bicycle
bicyclist
bike
biker
biking
body
cycle
cycling
cyclist
dangerous
downhill
equipment
exercise
extreme
fast
fit
fitness
forest
forrest
fun
group
guy
healthy
helmet
hill
leisure
man
motion
mountain
nature
outdoor
protection
race
recreation
ride
speed
sport
sportsmen
trail
video
view
wheel
woman