lesser circle of iris

例句：

1. 1. The doctor examined the patient's eyes and found a lesser circle of iris that was discolored.
   医生检查了病人的眼睛，发现虹膜的次级圆环颜色异常。
2. 2.The study revealed that the lesser circle of iris plays an important role in the eye's health.
   研究发现，虹膜的次级圆环在眼睛健康中起着重要作用。
3. 3. The patient's condition worsened after the surgery, and the doctor had to re-examine the lesser circle of iris.
   手术后，患者的病情恶化了，医生不得不重新检查虹膜的次级圆环。