iris shadow

例句：

1. 1. The photographer captured the iris shadow of the sunset.
   摄影师捕捉到了日落时的虹影。
2. 2. The artist used a technique to create an iris shadow on the canvas.
   艺术家使用了某种技巧在画布上创造出虹影效果。
3. 3.The scientist discovered that the iris shadow could be used as a marker for atmospheric conditions.
   科学家发现虹影可以作为大气状况的一个标记。