1. Acholuria is a condition characterized by the absence of bile pigments in the urine.
缺乏胆色素的情况是尿液中气色素的缺乏。

2. Acholuria can be a symptom of liver disease or obstruction in the biliary system.
缺乏胆色素可以是肝脏疾病或胆道系统阻塞的症状之一。