...here are lost of trees around the school » 有在学校周围的树木都将丢失 after many improvements being made » 经过多次改进 I knew he wouldn't do that! » 我知道他不会这样 ！
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本文经过多次改进和试验，最后采用链环式阴极结构，经生产实践取得了良好的效果。
After testing and improving many times, a chain link type cathodic design is finally set and good results have been achieved in production practice.
经过多次试飞和使用证明，所得的结论是正确的，改进是有效的。
Through several flight tests and applications, it is proved that the conclusions are correct and the improvements are effectual.
针对这一问题，经过多次调研，试验，找到问题所在，并对症下药，对其抱辊装置进行了改进。
To solve this problem, we had numerous research and experiments, and found the reason, and give right medicine, and improve its rolling devices.
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