再加则颜色渐深，直到厚厚的很多张纸时变成黑黑的一片了！

The more sheets of paper we add, the darker the color wills be. Until it's totally dark when there are thick sheets of paper.

youdao

从照明强度高的地方突然进入黑暗的地方时，眼睛一时无法感受物体的颜色，只觉得黑黑暗暗的一片，是不是类似的道理呢？

When we suddenly enter into the dark places from bright ones, our eyes cannot tell the colors of objects in a moment and we can only feel dark around, is not a similar sense of this?

youdao