但是，关联的多重性经常不是任意的，而依赖于属性值，这不能用图形建模语言，例如UM l类模型来表示。

However, the multiplicity of associations often is not arbitrary, but depends on attribute values, which cannot be expressed with graphical modeling languages such as UML class models.

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在 UML 中，关联与模型中的两个或多个类有关，关联由带数字的单箭头表示，数字意味着该关联的多重性。

In UML, an association relates two or more classes in a model and is indicated by an arrow on one end along with a number implying the multiplicity of that association.

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你在寻找多重性为1的关联结尾，记为1in UML2 (请见下面的图8)。

You are looking for association ends which have a multiplicity of one, symbolized by 1in UML2 (see Figure 8 following).

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