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.
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.
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.
提出了挖掘机动臂重量及重心位置的新的计算方法，结果精确可靠，该方法也适合于计算其它复杂的空间封闭箱型结构的有关机械力学特征。
A new method of calculating the weight and center of gravity of boom of excavator is put forward, which has accurate and reliable result.
提出了挖掘机动臂重量及重心位置的新的计算方法，结果精确可靠，该方法也适合于计算其它复杂的空间封闭箱型结构的有关机械力学特征。
A new method of calculating the weight and center of gravity of boom of excavator is put forward, which has accurate and reliable result.
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