A special case of a composite role is where a business object can only be uniquely identified when combining its key attribute with its parent's key attribute.
组合角色一个特殊情况是，业务对象只能通过将其键属性与父级的键属性进行组合来唯一标识。
By analyzing land use maps, combining statistic materials, connect the spatial data and attribute data and build dynamic change data base of land use.
通过对土地利用图的空间分析，结合统计资料，将属性数据和空间数据链接，建立起区域土地利用动态变化数据库。
Chaos is the attribute of some nonlinear dynamic system. Chaotic vibration formed from the combining of chaos and mechanical vibration is becoming an active field.
混沌是某些非线性动力学系统特有的内在属性，它与机械振动理论相结合而形成的新学科——混沌振动，正在成为一个日趋活跃的研究领域。
应用推荐