gradation of grain

例句：

1. 1.The data is presented in a gradation of colors.
   数据以颜色渐变的形式呈现。
2. 2.The gradation of the soil's nutrients affects plant growth.
   土壤养分的分级影响着植物的生长。
3. 3. The gradation of light intensity is crucial for photosynthesis.
   光强度的分级对于光合作用至关重要。