Not only will they likely contain more cache-friendly features, new versions also usually have important security and performance improvements.
不仅因为它们包含更多利于缓存的功能，新版本往往在性能和安全性方面都有很多的改善。
What's more, S3's security features let you further specify when people can download videos and even specify who can download them.
更重要的是，S3 的安全特性可以帮助您进一步指定人们何时可以下载视频，甚至可以指定谁可以下载。
Not only is it more efficient, modular, and XML-oriented, it is also flexible and extensible and it implements enterprise features such as security and reliability.
它不仅更高效、模块化、基于XML，而且具有灵活性和可扩展性，实现了安全性和可靠性等企业功能。
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