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Why can move up and down to draw water freestyle

KOBE, where2010-01-28 07:01:33 +0000 #1

firesniper2010-01-28 07:10:28 +0000 #2
Action and Reaction

you should pay attention to the foot of magnitude greater than the magnitude of the thigh, there combine to push the water backward trend.
lhs261222010-01-28 07:25:33 +0000 #3
What is up and down, which is the rotating

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