The entertainment department of our Student Union organizes an activity in which each class shoots a short movie.

我们学生会的娱乐部组织了一次活动，每个班级要为此拍摄一部短片。

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In the case of the UnionExpression class, the evaluate method evaluates the two operands, checks that the result is in both cases a node-set, and then forms the union using a sort-merge strategy.

如果是unionexpression类，evaluate方法将对两个操作数求值，检查在这两种情况下节点集的结果，然后使用排序合并策略组成联合。

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For example, the UnionExpr construct (written as a | b, and representing the union of two node sets) is implemented by the class com.icl.saxon.expr.UnionExpression.

例如，UnionExpr结构(写作a | B，并表示两个节点集的联合)由com . icl . saxon . expr . unionexpression类实现。

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