This model has the virtue of the directed hypergraph and is easy to be realized through object-oriented programming.

面向对象的有向超图参数化设计模型，用面向对象的程序设计方法可以很容易的实现。

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Recognized by their dresses to be gals of easy virtue, Courbet's two women lie on the grass, one of them looking positively blissed-out.

WSJ: A Rustling Theater of the Self | Impressionism, Fashion, and Modernity | Metropolitan Museum of Art | By Laura Jacobs