The 'Cover Texts' are certain short passages of text that are listed, as Front-Cover Texts or Back-Cover Texts, in the notice that says that the Document is released under this License.

“封面文字”是某些被加以列出的简短文字段落，在一个声明了是以本授权加以发行的文件中，依此作为前封面文字或后封面文字。

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This is a short lead-in to the document, usually about 20 words to introduce the document and provide a teaser for the remainder of the document.

这是文档的简介，通常只有20个左右的单词组成用以提供文档的简单信息。

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