返回两个集合的并集，可以选择保留重复项。
Returns the union of two sets, optionally retaining duplicates.
该程序实现给定两个整数集合的并集和交集，并且输出。
The program to achieve a given set of two integers and sets and intersection, and the output.
清单5 - 8演示了如何构造并初始化一个数组和两个一般集合库中的类。
Listing 5-8 demonstrates how to construct and initialize an array and two classes from the generic collection library.
该模型主要分为两个步骤：1）过滤掉句子集合中的非事件句子，并获得事件实例句子组成的集合；
The model is divided into two steps: 1) filter out non-event sentences and obtain candidate event instances;
该模型主要分为两个步骤：1）过滤掉句子集合中的非事件句子，并获得事件实例句子组成的集合；
The model is divided into two steps: 1) filter out non-event sentences and obtain candidate event instances;
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