事实上，对于存储的类本身，这种实用方法的实用性开始变得明显，如清单8所示。
Actually, much of the utility method's utility become apparent when placed onto the stored class itself, as shown in Listing 8.
在图1所示的简单类图中，可以看出这两个类有几个关系(如果这种复杂性看起来不自然，请忍耐一下；这是有意义的！)
In the simple class diagram of Figure 1, you can see that the two classes share a few relationships (just bear with me if all this complexity seems contrived: it serves a purpose!)
黄色肉芽肿性肾盂肾炎（XGP）的特征是CT示群集的类圆形的低密度区以及环形增强带形成“熊掌征”；
The CT features of Xanthogranulomatous pyelonephritis(XGP)include multiple, rounded, low density areas with enhancing rings arranged in a hydronephrotic pattern known as bear paw sign.
黄色肉芽肿性肾盂肾炎（XGP）的特征是CT示群集的类圆形的低密度区以及环形增强带形成“熊掌征”；
The CT features of Xanthogranulomatous pyelonephritis(XGP)include multiple, rounded, low density areas with enhancing rings arranged in a hydronephrotic pattern known as bear paw sign.
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