色素缺乏的

例句：

1. 1. The patient's skin was pale and lacked the usual pigmentation.
   患者的皮肤苍白，缺乏通常的色素。
2. 2. The child has achromatic eyes that are difficult to distinguish from those of other children.
   这个孩子的眼睛是无色的，很难与其他孩子的区分开来。
3. 3. Achromatic colors have been used in traditional Japanese art for centuries.
   无色的颜色在传统的日本艺术中已经使用了数百年。