准则4：使用条件特性（conditional attribute）代替 #if /#endif 块在相同的代码会编译成不同的版本，大多数会有调试（debug）和发布（release）两个版本。
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The compiler understands the conditional attribute, so it can do a better job of verifying code when conditional attributes are applied.
编译器可以识别Conditional属性，当条件属性被应用时，编译器可以很好的完成工作。
Acquiring optimal relative reduction by descending approach to core of attribute from original set of conditional attribute and combining with operator.
以原始条件属性集为起点并结合算子，通过向属性核的递减式逼近，得到属性的最小相对约简。
At present basically significance of conditional attribute in the decisional table based on rough sets is evaluated through dependability of conditional attribute.
目前粗糙集决策表中条件属性的重要性基本上是用条件属性的依赖度进行评判的。
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