英文關鍵字
changing
expertise
working
sport
machine
healthy
workout
lifestyle
health
power
bike
exercise
activity
gym
equipment
active
fitness
fit
room
stationary
cardio
people
leisure
indoors
muscle
cycle
training
concept
bicycle
gear
wheel
man
mechanical
mechanic
repair
maintenance
adjust
tool
pedal
cyclist
chain
repairman
service
business
biking
workshop
job
alignment
adult
position
adjustment
dismantles
flywheel
unscrews
screws
medium
plan