weatherreport类创建并拥有region对象，这通过代表聚合关系（aggregate relationship）的黑色菱形显示出来，它表示一个对象拥有并创建其他对象。
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Based on the aggregate relationship between of polycrystals and single crystals, orthotropic property of microscopic single crystals could be defined from macroscopic material by numerical simulation.
假定高温合金材料是单晶材料的集合体，通过数值模拟的方法，利用多晶与单晶之间的关系，可以由宏观材料参数估计微观单晶晶粒的材料属性。
It may also aggregate and disaggregate messages in a one-to-many relationship.
它还可以对一对多关系中的消息进行聚合和反聚合。
Uniform Design Method was applied to study the quantitative relationship between optimally dense situation and coarse aggregate composition.
利用均匀设计方法研究了最佳密实状态与粗集料组成之间的定量关系。
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