You'll never reach true Open Closed nirvana, but you can inch much closer by rigorously following the related Single Responsibility Principle: a class should have one, and only one, reason to change
你永远也达不到真正的开闭天堂，但是通过严格地遵循与之相关的单一责任原则：一个类应该有并且只有一个更改的理由，你可以非常靠近地接近它。
Footnotes should be typed single spaced at the bottom of the appropriate page and separated from the text by a 3-inch line starting from the left margin with one space above and below it.
脚注应键入单一间距在底部的适当的页数和分开的案文的一个3英寸线从左侧开始保证金与以上及以下这一空间。
Footnotes should be typed single spaced at the bottom of the appropriate page and separated from the text by a 3-inch line starting from the left margin with one space above and below it.
脚注应键入单一间距在底部的适当的页数和分开的案文的一个3英寸线从左侧开始保证金与以上及以下这一空间。
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