经过多年的努力，她于1996年来到清华大学学习生物学。
After years of hard work, in 1996, she went to Tsinghua University to study biology.
经过多年的努力，他们终于成功培育出了超级杂交水稻。
Finally, they succeeded in growing super hybrid rice after years of efforts.
经过多年的努力，她实现了在奥运会上得金牌的梦想。
After many years' hard work, she realized her dream of winning a gold in the Olympics.
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