tremulous iris

例句：

1. 1. The doctor examined her eyes and found that her iris was tremulous.
   医生检查了她的眼睛，发现她的虹膜颤抖。
2. 2.The old man's eyes were filled with tears as he gazed at the sunset.
   老人看着日落，眼里充满了泪水。
3. 3. The scientist observed the animal's eyes and noticed the tremulous iris.
   科学家观察了这只动物的眼睛，注意到了颤抖的虹膜。