The theories established in this paper give directions to the current design and produce of the three screw pump; and also give solutions of the problems during usage.
本文的基础理论研究对当前的螺杆泵的设计生产都有很好的指导作用，对当前三螺杆泵使用中出现的问题有很好的解决效果。
Therefore, how to further improve the performance of the screw machinery, especially reduce screw compressor operation consumption, was still the current development of the major issue.
因此，如何进一步改善螺杆机械的性能，特别是降低螺杆空压机的运行能耗，仍是当前研发的重大课题。
Background the current "gold standard" for treatment of chronic fracture nonunion in the metaphyseal-diaphyseal region of the fifth metatarsal is intramedullary screw fixation.
背景：目前治疗第五跖骨干骺端慢性骨不愈合的金标准是髓内螺钉固定。
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