例如，如果您决定将帮助信息作为工具提示，而不是在由用户请求打开的单独的窗口中，工具提示可能对屏幕阅读器用户是不具有易访问性的。
For example, if you decide to display help information as a tool tip rather than in a separate window that would open by user request, the tool tip might not be accessible to screen reader users.
盲文计算机、屏幕阅读器和基于语音指令的导航工具很难应付这种不断的变化。
Braille computers, screen readers, and navigation tools based on spoken instructions find this continuous change hard to deal with.
本文描述的官方工具有：语法检查器和屏幕阅读器。
The official tools described in this article are: a Web syntax checker and a screen reader.
Pagercrop是用来自动重构PDF文件，以更好得适应小的智能手机和电子书阅读器屏幕的免费的，简单的工具。
Windows/Linux: Papercrop is free, simple utility that automatically restructures PDF files to fit more comfortably on small smartphone and eBook reader screens.
Pagercrop是用来自动重构PDF文件，以更好得适应小的智能手机和电子书阅读器屏幕的免费的，简单的工具。
Windows/Linux: Papercrop is free, simple utility that automatically restructures PDF files to fit more comfortably on small smartphone and eBook reader screens.
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