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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因为类的多重继承有危险性。

Because multiple inheritance of classes is dangerous.

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由于民事关系的复杂性、民事违法行为性质的多重性，因而在实践中不可避免地会经常出现这两类责任发生竞合的现象。

As the complexity of civil relations, the nature of the multiplicity of civil offenses, which in practice will inevitably occur two types of responsibility are often competing phenomena.

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