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。
A closer look at the one-inch foam sheathing that helps insulate the building.
一个在一英寸的泡沫绝缘护套，帮助建设一探究竟。
A closer look at the one-inch foam sheathing that helps insulate the building.
一个在一英寸的泡沫绝缘护套，帮助建设一探究竟。
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