该方法有简单，避免奇异积分、解设定常数的方程组状态好等优点。

This method has the advantages of simplicity, no improper integrals and good conditions of simultaneous equations with constantcoeffients.

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可用来设定定义编译器行为的编译属性，例如编译器警告、最佳化和编译常数。

Allows you to set compilation properties defining compiler behavior, such as compiler warnings, optimizations, and compilation constants.

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条件式编译常数的范围取决于它的设定方式。

The scope of a conditional compilation constant is dependent on the way it is set.

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