The main quality problems of China - produced CNC system have been discussed in this article, and how to make quality better of CNC system as well.

讨论了国产数控系统质量差的主要表现、产生原因，以及提高产品质量应采取的关键措施。

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There are two main tasks assigned to quality circles: the identification of problems; and the suggestion of solutions.

质量管理小组有两个主要的任务: 找出问题; 以及提出解决问题的建议.

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Crack in neck of hollow shaft is a very serious malfunction, main cause of the crack include: foundry defect, centralized stress, quality problems of welding and heat treatment.

中空轴轴颈裂纹是水泥磨的严重故障。中空轴轴颈裂纹产生的原因主要有：铸造缺陷，应力集中，焊接和热处理质量问题等。

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The conference centered on three main problems to getting and keeping girls in school: violence,poverty and poor quality education.

VOA: special.2010.05.20