An association between two elements can be shown either as an attribute in the class or as an association to the related element.

两个元素之间的关联要么显示为这个类中的一个属性，要么显示为这个相关元素的一个结合。

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The association of an attribute with a particular value is called a condition .

一个属性的特殊值所关联的内容被成为条件。

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The tag's cascade attribute specifies the cascading style to be applied to this association.

标签中的cascade属性用来指明这种多对多关系的联机类型。

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