英文關鍵字
action
adrenaline
autumn
bicycle
bike
brave
break
caucasian
core
courage
danger
dangerous
dedicated
dedication
dirt
down
downhill
fast
fearless
female
flat
forest
girl
gravel
hard
helmet
hill
jump
leave
lube
motion
pump
repair
ride
rider
route
slow
speed
stone
sunny
suspension
tire
tough
tree
turn
wheel
young