Their page requests flow through a web monitoring service, which can block or report access to certain sites.

通过网络监督服务，雇员上网访问页面的指令可能会被阻止，或被发送到另一网站。

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If other networks — and their admins — realize that your server is the source of spam, they're likely to block your server's IP address from access to or from their network.

如果其他网络及其管理员意识到您的服务器是发送垃圾邮件的源头，那么很可能阻止您的服务器的IP地址访问他们的网络。

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Each building block is a service, which means you can access each one in a standard way without regard to its implementation or location.

每个构件都是一个服务，这意味着您可通过标准方法来访问服务而不必关注其具体实现及其位置。

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It features a tiny keyboard built for small hands, as well as parental control software that can limit log-on time or block access to certain Web sites and applications.

FORBES: Magazine Article

Some security programs, firewalls or routers may block your access to the embedded player.

BBC: Your guide to the BBC Embedded Media Player

Furthermore, independent risk research can hardly be conducted since the companies can block access to research material or ask the scientists to sign contracts where they agree not to publish anything that is not agreed with the company.

FORBES: Does the Seralini Corn Study Fiasco Mark a Turning Point in the Debate Over GM Food?