该算法不仅可以求多边形的“交”，而且可以求多边形的“并”和“差”。
This algorithm can be used to calculate not only intersection but also set-theoretic differences and union of two polygons .
文章给出了可能性空间中子集的包含、并、交、差、余关于可能性测度、必要性测度和信任性测度的一些性质。
This paper deals with some properties of possibility measure, necessity measure, credibility measure for containment, union, intersection, difference, complementation of sets in possibility space.
在同一三向DEXEL模型空间，实现并、交、差布尔运算。
Under the same three directions DEXEL space, Boolean operations such as union, intersection, and subtraction are implemented.
在两个单环并、交、差图形运算的基础上，提出通过搭接单向桥边的方法，将单环算法直接向多外环、多内环拓展。
The algorithm of two loops (single loop) Boolean operation and the algorithm of the one-way bridge edge are presented.
丙交酯的产率低，同时聚乳酸的亲水性差，降解速度慢，限制了聚乳酸在生物医药领域的应用。
However, the yield of lactide wasn't satisfical, and hydrophilicity of PLA was so bad that it leaded to low degradation rate, these shortcomings limited its use in some biomedical fields.
证券、资金交收存在时间差，但未建立相应的担保机制；
The securities, fund are handed in and received and keep in the time difference, but has not set up corresponding guarantee mechanism;
通过多面体的三向DEXEL模型与并、交、差布尔运算，生成任意复杂型体的三向DEXEL模型。
A DEXEL-oriented algorithm of polyhedrons was proposed and a three direction DEXEL model was constructed.
通过多面体的三向DEXEL模型与并、交、差布尔运算，生成任意复杂型体的三向DEXEL模型。
A DEXEL-oriented algorithm of polyhedrons was proposed and a three direction DEXEL model was constructed.
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