These heuristics act as filters that can be parameterized and toggled to perform the web block information extraction.

这些试探起到过滤器的作用，通过参数的设置和调整，可使它更好地达成对主体信息块的抽取。

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Most schools configured the machines to block e-mail, chat, games and Web sites reached by searching on objectionable key words.

大多数学校在计算机上加入了阻止电子邮件、聊天、游戏和限制关键字搜索网页的配置。

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Tables used to be the main building block of Web pages, but now they're considered bad practice as page layout elements.

表格被用作网页的主要构建块，但是作为页面布局元素，使用表格现在被认为是糟糕的做法。

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This week,the United Arab Emirates announced it would block BlackBerry e-mail,web browsing and instant messenger services on October eleventh.

VOA: special.2010.08.06

Also know that by design, scripts block a Web browser from doing parallel downloads, so browsers have to wait until a script is downloaded from Google before moving on to any others.

FORBES: When Google Goes Down Bad Things Happen To The Web

Parents may pre-emptively block purchases from Web sites, and instantly lock the card after seeing anything objectionable.

FORBES: This Week In Credit Card News: Steady Credit Card Use, New Justin Bieber Card Videos

This would allow the industry to block access to web sites both in Germany and outside the country that have been found to carry pirated music.

BBC: Online services liable for bootlegs