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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". 任何人都可以在由自由软件基金会（Free Software Foundation）所公开发行的GNU自由文档许可证1.2或之后版本的条款下，复制、发行及／或修改任何维基教科书的文章，不附带不可变章节，封面文本以及封底文本。完整的许可证文本包括在GNU自由文档许可证中。 注意：中文翻译只作参考，英文原文才具有法律效力。 |