她四处奔走，在不同的培训会议上学习……经过几年的努力，刘成功了。
She traveled around to learn at different training meetings ... After a few years' hard work, Liu succeeded.
他的同学们称，无论他做什么，经过几年的努力，他都能做得很好。
His classmates said whatever he did, he could get quite good at it after trying hard for several years.
公司建立于2003年，经过几年的努力。
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