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.
item类与前一篇文章中使用的一样，但是不再实现任何手工序列化方法。
The Item class is the same one used in the previous article, but it no longer implements any manual serialization methods. Figure 1 depicts this simple setup.
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