在可扩展操作系统研究中存在两种途径，但这两种途径都存在明显的缺陷。

Current researches into extensible operating systems have focused on two approaches, but there are some shortcomings in these researches.

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本文首先介绍了可扩展操作系统的历史背景。然后，分析了可扩展操作系统结构下设计存储管理子系统的三个关键问题：性能、可扩展性和完整性。

Firstly, this paper introduces the history of extensible OS, and then analyses three key issues in memory management under extensible OS, which are performance, extensibility and integrity.

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话虽这么说，Android手机确实利大于弊，Android操作系统是开源的、可行的、可扩展的，并且市场份额迅速增长，这对droid手机购买者来说意味着什么？

That being said, Android phone pros really do outweigh the cons. Android OS is open source, workable, developable, and growing quickly.

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