iris cell

例句：

1. 1. The iris cell is responsible for filtering light and controlling the amount of light that enters the eye.
   虹膜细胞负责过滤光线并控制进入眼睛的光线量。
2. 2. In some species, the iris cell can change color to signal danger or alert others.
   在某些物种中，虹膜细胞可以变色以发出危险或警告信号。
3. 3. Researchers are studying how the iris cell changes in response to different lighting conditions.
   研究人员正在研究虹膜细胞如何响应不同的照明条件。