achromaturia

例句：

1. 1.The absence of achromaturia in the patient's urine indicates that the disease is not present.
   患者的尿液中没有无色素体，表明疾病不存在。
2. 2. The study found that achromaturia was associated with an increased risk of cancer.
   研究发现，无色素体与癌症风险增加有关。
3. 3.Achromaturia is a rare condition that can lead to blindness if left untreated.
   无色素体是一种罕见的状况，如果不治疗，可能会导致失明。