union of sets

例句：

1. 1. The union ofsets is a fundamental concept in computer science.
   集合的并集是计算机科学中的一个基本概念。
2. 2. The union of sets is usedto find the common elements between two ormore sets.
   集合的并集用于找出两个或多个集合之间的共同元素。
3. 3. Theunion of sets is often used in dataanalysis to identify patterns and trends.
   集合的并集在数据分析中常被用来识别模式和趋势。