First among them is its lack of provision for graceful degradation.
首先，它缺乏对功能退化的预防。
The first one can be handled by what is know as progressive enhance or graceful degradation.
第一个级别的可访问性可以通过所谓的“逐步加强（progressive enhance）”或着“优雅降级（grace degradation）”来实现。
Simple translation, or "graceful degradation" of a feature set, isn't sufficient to meet people's needs.
简单的翻译，或者功能上的“优雅降级”，都不足以满足人们的需要。
You will still have to provide fall-back support for IE6, however, either with conditional comments or through graceful degradation.
尽管如此你仍不得不通过条件注释或优雅降级的方法对IE6提供支持。
Browser support for some is limited, but CSS is designed for graceful degradation; a page should still be legible and usable if a style isn't applied.
浏览器对某些选择符的支持还不是很充分，但是CSS的设计允许平稳退化；如果无法应用某个样式，页面应该仍然是合法有效的。
Without graceful degradation, Ajax-based mashup applications might find themselves missing out on both a minority user base as well as search engine visibility.
如果没有功能方面的让步，基于Ajax 的mashup应用程序也可能会发现自己失去了部分用户群，搜索引擎的吸引力也会降低。
The performance characteristics of the system are the dynamic scheduling of tasks, the cooperation between computers, graceful degradation, resource sharing and so on.
该系统的性能特点是任务的动态调度、机间合作、优美降级和资源分享等。
The performance characteristics of the system are the dynamic scheduling of tasks, the cooperation between computers, graceful degradation, resource sharing and so on.
该系统的性能特点是任务的动态调度、机间合作、优美降级和资源分享等。
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