up and down ,again and again,hour and

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upanddown,againandagain,hourandupanddown,againandagain,hourandupanddown,againandagain,hourandupanddo

up and down ,again and again,hour and
up and down ,again and again,hour and

up and down ,again and again,hour and
up and down 上下颠倒,上上下下 again and again 一遍又一遍,反反复复 hour and hour 一个又一个小时