They work by learning the details of the particular markup and figuring out where the actual data is. For example, in the illustration below the scraper extracts URLs from the del.icio.us.

它们通过分析网页特定的标注方式找到实际数据，例如，下图给出了抓取器怎么抓取del . icio . us的页面的示意图。

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Even imagining things contrary to our knowledge contributes to the growth of knowledge, for example in learning from our mistakes.

即使是与我们知识相悖的想象也能够增长我们的知识，例如我们可以从错误中学习。

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English speakers learning Spanish, for example, can write or speak descriptions of a vacation and receive feedback on their grammar and choice of idioms from native Spanish speakers on the network.

例如，以英语为母语的人学习西班牙语可以用写或说的方式描述一个假期，然后在网上便可以从以西班牙语为母语的人那儿收到有关语法及熟语的选择方面的反馈信息。

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The simple example is learning about which product to buy or where to get it from the advice of friends.

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Entering into a design process, for example, can help gain buy in from teachers and others in the community for adopting blended learning, which is still radically different from traditional schooling.

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Officials say children who do not visit will benefit from learning about the experiences of those who do and say schools could set up their own commemoration projects, for example collecting photographs and uncovering local stories.

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