Multiplicity: You can designate the multiplicity of a relationship between two entities — for instance, each basket-weaving class must have between 20 and 30 students.
多重性：您可以指派两个实体之间的关系具有多重性。例如，每一节篮子编织课程上必须有20到30名学生。
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.
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。
The existence and multiplicity results are obtained for a class of fourth-order nonlinear elliptic equations by the least action principle and the minimax methods, respectively.
通过极小化作用原理和极小极大方法得到了一类四阶非线性椭圆方程解的存在性和多重性。
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