An RSS document is an XML file that contains a number of discrete news items, such as entries in a Web log (see Figure 1 for a sample RSS feed).

RSS文档是一个XML文件，它包含大量离散的新闻项，如某个网志中的入口项(rss提要的例子参见Figure1)。

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In sampling, we choose a small number of items which we think are typical of the whole and examine the sample.

在采样时，我们选择少量我们认为是代表整体的东西，并对这个样本进行研究。

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In sampling, we choose a small number of items which we think are typical of the whole and examine the sample.

在采样时，我们选择少量我们认为是代表整体的东西，并对这个。

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In sampling, we choose a small number of items which we think are typical of the whole and examine the sample.

在采样时，我们选择少量我们认为是代表整体的东西，并对这个。

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