The advantage here is the ability to perform set operations on keys and items without having to copy them.
这样做的优点是，可以直接在键和条目上进行集合操作，而不需要再复制一次。
For example, you can determine distances between two geometries, perform spatial set operations like unioning or intersecting geometries, and retrieving the length of a linestring.
例如，可以确定两个图形之间的距离，执行空间集合操作，如合并或交叉图形，获取一个 linestring 的长度。
While other set operations may be defined, the operations of complementation, union, and intersection are of primary interest to us.
虽然我们可以定义其他一些集合运算，但求补、并和交运算是我们最感兴趣的三个集合运算。
The set operations do a DISTINCT on the rows returned.
集合操作会对返回的记录进行一个DISTINCT操作。
This paper proposes a new approach to robust polyhedral Boolean set operations.
提出一种可靠的多面体布尔集合运算方案。
OWL supports the basic set operations, namely union, intersection and complement.
OWL支持基本的集合操作，即并，交和补运算。
This allows the use of set operations to build up complex classes from anonymous classes or classes with value restrictions.
这样就允许我们通过使用集合操作来从匿名类或具有值约束的类来创建复合类。
Property discussions of set operations and some examples are put forward to show the application in proving specific problems.
讨论了这些集合运算的性质，并给出了若干实例，说明在论证具体问题中的应用。
The final solids of strata are represented by polygonal boundary representations, which are constructed by Boolean set operations.
地层实体用多面体的边界表示法来表示，由布尔集合运算来获得。
Tested examples show that the set operations can work well under any situation provided the polyhedra to be operated are not morbid.
测试实例表明，只要参加集合运算的多面体不是病态的，该方案均能得出合理的运算结果。
Secondly, the paper summarizes the main representations of 3d modeling and carries ona research to the set operations of 3d modeling.
其次，概述了主要的几个三维模型的表示法，并对三维实体间的集合运算进行了研究。
Indicates that a class can use a markup extension to provide a value, and references a handler to use for markup extension set operations.
指示类可以使用标记扩展提供值，并引用要用于标记扩展设置操作的处理程序。
Set Operations — In Linux you can make operations with files quickly.
集合操作 —Linux下你可以快速操作文件。
In this paper, a new set-representing method, depicting function method, is presented, and set-operations under the method is discussed.
本文提出了一种新的集合表示方法即刻划函数方法，并且讨论了在该表示方法下的集合运算。
In this paper, a new set-representing method, depicting function method, is presented, and set-operations under the method is discussed.
本文提出了一种新的集合表示方法即刻划函数方法，并且讨论了在该表示方法下的集合运算。
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