在这个例子中，系统按一种特殊的缺省排序方法(如按价格和运输成本)显示搜索结果，但用户也可以按照其他属性(如只按价格)重新对显示的内容排序。

In this case, the system displays the search results with a particular default sort (such as price and shipping cost), but the user can redisplay by other attributes, such as by price alone.

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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。

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.

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仿真结果表明，模糊综合评判排序方法通过设置各因素权重，可在综合考虑各因素的基础上使得系统总延迟尽量减少。

The simulation results indicated that this sequencing method could reduce the total delay of the system as much as possible, by setting the weights for main factors which affect aircraft sequencing.

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