Second-level filtering gives you low-level control over how messages are routed.

第二级过滤为如何路由消息提供了低级控制。

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In other words, a policy may apply first-level filtering while route objects apply second-level filtering on all received messages.

换句话说，对于所有接收到的消息，策略应用第一级过滤，而路由对象应用第二级过滤。

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You can therefore apply filtering at this level in a typesafe manner.

因此你可以以类型安全的方式在这一级别应用过滤。

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An individuals ability to receive and share information with world has grown exponentially due to the amalgamation of digital platforms that allow for the filtering of content on a level thought unimaginable only a generation ago.

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The truly paranoid may elect to use the 2.4 kernels' Netfilter4 facility (adding stateful packet filtering) or a commercial application-level proxy gateway.

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The report said that for more selective universities, such as those in the Russell Group who tend to ask for higher A-level grades, mathematics requirements can be a useful filtering tool.

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