The Expression problem is a real, practical problem in object-oriented programming, and most common solutions to it are inadequate.
表达式问题在面向对象的编程中是真实的、实际的问题，且针对它的最通用的解决方案是不足的。
If you've spent a significant amount of time working with object-oriented languages, you've probably run into examples of the Expression Problem.
如果您已经花费了大量的时间使用面向对象的语言，则您可能已经遇到了表达式问题的例子。
With object oriented method, the expression of part's feature and algorithm of blank expanding is described in detail.
利用面向对象的方法，对冲压件形状特征的表达和毛坯展开算法进行了详细的描述。
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