If we classify these users by project, then, from a project-by-project point of view, the defect database appears to be unique for each user and each project.

如果我们根据项目对这些用户进行分类，那么从一个个项目的观点来看，缺陷数据库看起来对每个用户和每个项目都是唯一的。

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A refractive defect of a lens or other optical system that prevents light rays from converging at a single point resulting in a blurred or imperfect image.

散光有折射缺陷的透镜或其它光学系统，阻碍光线汇聚于一个焦点，形成一个模糊或不完全的图象。

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This paper analyzes the cause of civil-situ floor defect from the construction point of view, and put forward control measures to prevent casting slab defects.

文章分析了民用建筑现浇楼板缺陷产生的原因，着重从施工角度上提出了对现浇楼板产生缺陷的防治措施。

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