achromatic sheet

例句：

1. 1. The painting depicts a landscape with achromatic colors.
   这幅画描绘了一个用无色色彩描绘的风景。
2. 2.The scientist discovered an achromatic substance that could be used for medical purposes.
   科学家发现了一种无色物质，可以用来医疗目的。
3. 3. The achromatic filter is commonly used in photography to eliminate unwanted color.
   无色滤镜在摄影中常用来消除不需要的颜色。