没错，直升飞机的设计师们就是在反复研究了蜻蜓的翅膀后，经过不断改进才使直升飞机的性能到达完善成果的。
That's right, the designers of helicopter be at studied dragonfly again and again of wing after, pass by to improve continuously function of making the helicopter to just attain perfect result.
管涌形成主要受控于堤基土体结构、土的物理力学性质和洪水位，经过不断改进的减压井等工程措施对防止管涌是有效的。
The formation of piping is controlled by the structure, physical and mechanical properties of the soil for the base of dike and flood level.
华士焊接人经过十多年的不懈努力，不断改进产品质量、提升产品的稳定性和可靠性。
Huashi People continuously improve product quality, increase the stability and reliability of product through ten years of persisting efforts.
经过几年的不懈努力，不断总结，不断改进，现已成为省级计量管理工作先进单位。
After unremitting endeavors in several years, summarizing unceasingly, and improving unceasingly, it already became the advanced unit of provincial level measurement supervisory work.
经过几年的不懈努力，不断总结，不断改进，现已成为省级计量管理工作先进单位。
After unremitting endeavors in several years, summarizing unceasingly, and improving unceasingly, it already became the advanced unit of provincial level measurement supervisory work.
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