I'd like to start with a discussion of the Open Closed Principle and other related ideas popularized by Robert C. Martin in his book, Agile Software Development, Principles, Patterns, and Practices.
我喜欢以讨论开闭原则和其他由robert C.M artin在其著作《敏捷软件开发，原则，模式和实践》中所倡导的相关主题作为开始。
The whole book was evenly fold into rectangle form so it can be opened and closed like a folding fan.
全书按照特定行数，均匀地折叠成长方形折子，可象扇子样开启或折叠，从中反映我国书籍装帧之精妙。
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