本文对“分层分组教学”教学法谈了自己的见解和做法。

In this paper, "Hierarchical group teaching," teaching about his views and practices.

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目前的多播密钥管理方案主要包括集中式、分布式和分层分组式，它们各有优缺点，适用于不同的情况。

At present, group key management mainly divided into centralized, distributed and hierarchical forms, all of them have their own character and can be used in different applications.

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除了原始平台层之外的所有分层都并不严格；这些分层是以软件要素的可观测逻辑化分组为基础的。

None of the layering, except for the original platform layer, was strict; it was based around logical, observable groupings of software elements.

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