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.

youdao

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).

youdao

具体到本例，考虑所有关联结尾的外键的建立都带有多重性“1”。

For this example, consider the creation of a foreign key for every association end to occur with a multiplicity of "one". As a consequence, two things may occur.

youdao