pigmented spots

例句：

1. 1.The paint on the wall has a lot of pigmented spots.
   墙上的油漆有很多斑点。
2. 2. The old photo has several pigmented spots that are difficult to remove.
   这张旧照片上有几个难以去除的斑点。
3. 3.The ground was covered with pigmented spots left by the rain.
   地面被雨水留下的斑点覆盖着。