英文關鍵字
closeup
trolley
spike
slider
aluminum
rails
rotation
rollers
device
mechanism
equipment
man
caucasian
exercise
simulator
sitting
movement
muscles
hands
own
weight
rafting
rowing
stick
imitation
pull
training
hobby
rope
iron
professional
school
individual
tourism
specialized
championship
competitiveness
canoe
kayak
ocean
extreme
danger
boat
race
time
sport