它将此函数应用到序列中的前两个元素。
It applies the function to the first two elements in the sequence.
图3演示了此场景的事件序列，其格式设置与前一个示例相同。
Figure 3 illustrates the sequence of events for this scenario, formatted the same as the previous example.
图1显示了测试序列中前两个步骤所需的平均时间的总和，即使用解析器构建文档，并遍历文档表示以检查其中的内容。
Figure 1 shows the sums of the average times required for the first two steps in the test sequence, building a document from the parser, and walking the document representation to check the content.
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