A property can be many-valued or single-valued.

属性可为多值的，也可为单值的。

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The name property is a single-valued containment reference.

name 属性是一个单值包容引用。

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GDS supports both proxy (single-valued association) and lazy fetching for collections.

GDS既支持代理(单值关联关系)，也为集合支持懒抓取。

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However, under his reforms the majority of pupils would sit a single examination rather than being split into those taking lower valued CSEs and more academic O-levels.

BBC: Gove admits GCSE pupils treated unfairly in grades row