According to the defect of present decision tree method some improved methods are given in the paper, it is a replenishment to the present method.
本文针对现行决策树方法的缺点提出几种改进的方法，它是对现行方法的一种补充。
Sometimes the patient looks and smells just like a common duct stone but no filling defect or stone is seen in the biliary tree on cholangiogram.
有时，患者症状象总胆管结石，但是胆管造影在胆管分支未见充盈缺损。
Sometimes the patient looks and smells just like a common duct stone but no filling defect or stone is seen in the biliary tree on cholangiogram.
有时，患者症状象总胆管结石，但是胆管造影在胆管分支未见充盈缺损。
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