The W3C HTML5 Specification (Working Draft) explicitly recognizes this and provides detailed examples for alt text depending on the function and context of the image.

W3C的HTML5规范(草案) 明确指出了这一点，并详细示范了如何撰写基于功能和上下文的替换文本。

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Along with the input string, the SUBSTRING function has three other arguments, which are start position, length, and code unit specification.

除了输入字符串之外，SUBSTRING函数还有其他三个参数，它们分别是：起始位置、长度和代码单元指定。

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"Tells us that the bind will be made asynchronously, and the ReadAsync function provides the specification of how the BeginRead and EndRead methods should be called."

告诉我们，接下来的赋值过程将使用异步的方式，而ReadAsync函数为BeginRead和EndRead方法如何被调用提供了规范。

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