目前已经提出了许多结构连接的算法，它们中的大多数都基于如下的前提条件之一：输入元素集合存在索引或者有序。
There have been a number of algorithms proposed for structural join, and most of them are based on one of the following assumptions: the input element sets either have indexes or are ordered.
基于能量等效原理提出了复合材料有效弹性模量的定义，并指出了该定义的基础及前提条件。
A definition of composite effective elastic moduli is presented based on the energy equivalence principle and its basis and premise are pointed out.
对快速排序算法，基于枢轴元素的随机选取这一前提条件，对这一算法进行了时间平均性能的分析。
To the problem of quick-sort, the authors give an average capacity analysis of the algorithm which is based on random choice 'pintle'.
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