文件可以不包含不变章节。
“不变章节”是标题已被指定的某些次要章节，在一个声明了是以本授权加以发行的文件中，依此作为不变章节。
The 'Invariant Sections' are certain Secondary Sections whose titles are designated, as being those of Invariant Sections, in the notice that says that the Document is released under this License.
如果一个章节并不符合上述有关于次要的定义时，则它并不允许被指定为不变。
If a section does not fit the above definition of Secondary then it is not allowed to be designated as Invariant.
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