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.
经过他们一点一滴地不懈努力，委员会消除了一个又一个教义上的分歧，每隔几年还发表一份公文，应该就是文中那无懈可击的话语消除了分歧。
Painstakingly, at snail's pace, the commission took one doctrinal difference after another, and every few years produced a document in impenetrable language that was supposed to have ironed it out.
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