此实现是封闭的：在您编译FulfillmentGenerator类以后，在不编辑源代码和重新编译的情况下，您无法将invoice方法扩展到新的类型。

And this implementation is closed: After you compile the FulfillmentGenerator class, you can't extend the invoice method to new types without editing the source code and recompiling.

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在分析了基于边缘的图像检索方法的缺点后，提出了一种基于显著封闭边界的图像检索新算法。

Having analyzed the drawbacks of image retrieval methods based on edges, a novel image retrieval algorithm based on salient closed boundary is presented in this paper.

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提出一种新的由矿物中封闭径迹长度分布求解地质热历史的反演模拟计算方法，由该方法可得到地质热历史的唯一解。

A new inverse method for geothermal history calculation has been suggested. Differing from other methods this one can give an unique solution.

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