Later on through years of practice.

后来经过多年的练习啊。

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Through years of practice and research, It was found that the feeding device's structure of this machine is of defects.

经多年实践探索发现，该机型生头杆本身在设计构造上就存在一定缺陷。

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Through years of practice and theoretical analysis, we obtain the best separation result and the impurity after separation is smaller than 1% and the best result can reach 99.9%.

通过多年的实践与理论分析，获得的最佳分选效果，分选后的杂质可小于1%，即分选效果最高可达99.9%，并且属于完全物理分离，分离后各种材料的性质都不改变，不影响再生利用。

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In seeking a golf professional to help you with your game, insure that the individual has an active accreditation with the PGA or LPGA, or, has demonstrated an inarguable ability to help players of many levels improve through many years of practice.

CNN: How to choose a golf instructor

Jeffery Belden, a family physician and associate professor at the University of Missouri medical school who went through its communication training last year, says that after 25 years in practice, he was skeptical at first.

WSJ: Talking Cure for Health Care: Improve Doctors' People Skills