多代理检测系统同时在不同层次监视联网计算机的活动情况，包括用户级、系统级、进程级和数据包级。

The multi agent detection system can simultaneously monitor networked computer's activities at different levels, including the user level, system level, process level and packet level.

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与包级不同，在文档级上可以创建和保存不同类型的od f文档(. odt、。odp、。ods文件)，还可以把文档嵌入另一个文档。

Unlike the package level, the document level can create and save different types of ODF documents (.odt,.odp,.ods files), and also embed a document into another document.

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在本文中，我将继续讨论这些概念，讲解一级函数、优化和闭包。

In this article, I'll continue this tour of concepts by talking about first-class functions, optimizations, and closures.

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