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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例如，一系列事件可以被一次性记录，然后以全自动的方式自动回放任意遍。

For example, a sequence of events could be recorded once and then automatically played back any number of times in a fully automated way.

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