回想起过去的三年，我懂得了要想成功，就必须努力学习．
on the past three years， I have learned that if I want to succeed， I must study hard．
回想起过去的三年，我懂得了要想成功，就必须努力学习．
on the past three years， I have learned that if I want to succeed， I must study hard．
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