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.
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.
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