free-settling ratio

例句：

1. 1.The free-settling ratio of the soil is an important factor in determining its quality.
   土壤的自由沉降比是决定其质量的重要因素。
2. 2. The free-settling ratio of the soil affects the growth of plants.
   土壤的自由沉降比影响植物的生长。
3. 3.The free-settling ratio of the soil can be used to predict the quality of the soil.
   土壤的自由沉降比可以用来预测土壤的质量。